J3420
J3420 – Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg · NDC Crosswalk & Billing Units
HCPCS Level II J-code · Medicare Part B drug billing
J-code
● 65 NDCs crosswalked per 1000 MCG $0.683/unit ASP+6%
📋 J3420 summary
J3420 is a HCPCS Level II J-code used to bill vitamin b-12 cyanocobalamin, up to 1000 mcg, billed per 1000 MCG. The number of billing units to report depends on the dose administered and the NDC/package billed — use the calculator below.
Brand names associated with J3420: Cyanocobalamin Injection*, Cyanocobalamin
Code J3420
Billing unit 1000 MCG Payment limit $0.683/unit NDC-Crosswalk 65
Quarter Q3 2026
RxCUI Atlas Trace the drug concept →
⚠ An NDC↔HCPCS crosswalk and a published payment limit do not guarantee payer coverage or payment. Always verify the current payer policy and claim format before billing.
🗂️ Key billing facts
HCPCS codeJ3420
DescriptorInjection, vitamin b-12 cyanocobalamin, up to 1000 mcg
Billing unit1000 MCG
Payment limit / unit$0.683
Est. ASP / unit$0.644 est.
Mapped NDCs65
Data periodQ3 2026
Last updated2026-08-20
💊 About Cyanocobalamin Injection DRUG GUIDE
Cyanocobalamin Injection is used to treat vitamin B12 deficiency when the body cannot absorb B12 properly through the gut.
This includes conditions like pernicious anemia (Addisonian anemia), certain gastrointestinal diseases or surgeries, fish tapeworm infestation, folic acid deficiency, and cancers of the pancreas or bowel.It is also used for the Schilling test, a medical test that measures how well the body absorbs vitamin B12.
Clinical overview from our editorial drug guide for Cyanocobalamin Injection. For billing reference, see the sections above.
🧾 Billing & reimbursement HCPCS · CMS · EFF. Q3 2026
📅 Payment limits effective Q3 2026 — from the CMS Medicare Part B Payment Limit File (revised quarterly).
Medicare payment limit / unit
$0.683
Est. ASP / unit
$0.644 est.
Est. after 2% sequester
$0.669
HCPCS dosage
1000 MCG
The CMS payment limit is the Medicare Part B drug allowance (ASP + 6%, statutory). After the 2% federal sequester the effective payment is ≈ ASP + 4.3%; estimated ASP = payment limit ÷ 1.06. Source: CMS Medicare Part B Payment Limit File (quarterly), Q3 2026.
Full HCPCS code details (official CMS record)
Long descriptionInjection, vitamin b-12 cyanocobalamin, up to 1000 mcg
CoverageD — Special coverage instructions apply
Pricing indicator51 — Drug — priced under the ASP methodology
Type of service1 — Medical care
BETOS-2O1E
ASC payment group—
Action codeN — No maintenance this year
Effective date1997-01-01
Date added1986-01-01
Source: CMS HCPCS Level II code file (imported via admin).
🧮 Dosing & billing-units calculator HCPCS UNITS
One billing unit of J3420 = 1,000 mcg. Enter a regimen to convert dose → billing units and project a full course.
Billing units = dose ÷ HCPCS unit size. Most payers require whole units — round per the payer's policy. “Est. Medicare pay” uses the current payment limit. For single-dose vials, drug discarded after administration may be separately billable with modifier JW (JZ when none is discarded) where allowed. Always verify payer-specific rounding before billing.
🔁 NDCs that bill under J3420 LEAST EXPENSIVE FIRST
65 NDCs map to J3420. Bill units = how many HCPCS units one package represents. Est. pay / pkg = payment limit ($0.683/unit) × that package's bill units.
| NDC (11-digit) | Drug | Labeler | Package | Strength | Bill units | Est. pay / pkg | NADAC / unit | Status | Source |
|---|---|---|---|---|---|---|---|---|---|
| 00143-9619-10 | Cyanocobalamin 1000 ug/mL INJECTION | Hikma | 10 VIAL, MULTI-DOSE in 1 BOX (0143-9619-10... | 1000 ug/mL | 300 | $204.90 | $0.328 | ● Active | CMS ASP |
| 70069-0171-10 | CYANOCOBALAMIN 1000 ug/mL INJECTION, SOLUTION | Somerset | 10 VIAL in 1 CARTON (70069-171-10) / 30 m... | 1000 ug/mL | 300 | $204.90 | $0.328 | ● Active | CMS + PDAC |
| 69680-0121-10 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | Vitruvias | 10 VIAL, MULTI-DOSE in 1 BOX (69680-121-10... | 1000 ug/mL | 1 | $0.68 | $0.328 | ● Active | PDAC |
| 69680-0121-05 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | Vitruvias | 5 VIAL, MULTI-DOSE in 1 BOX (69680-121-05)... | 1000 ug/mL | 150 | $102.45 | $0.549 | ● Active | CMS + PDAC |
| 70710-1665-05 | cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | Zydus | 5 VIAL, MULTI-DOSE in 1 CARTON (70710-1665... | 1000 ug/mL | 150 | $102.45 | $0.549 | ● Active | CMS + PDAC |
| 70710-1665-01 | cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | Zydus | 1 VIAL, MULTI-DOSE in 1 CARTON (70710-1665... | 1000 ug/mL | 30 | $20.49 | $0.761 | ● Active | CMS + PDAC |
| 00143-9620-10 | Cyanocobalamin 1000 ug/mL INJECTION | Hikma | 10 VIAL, MULTI-DOSE in 1 BOX (0143-9620-10... | 1000 ug/mL | 100 | $68.30 | $0.777 | ● Active | CMS ASP |
| 69680-0113-99 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | Vitruvias | 10 VIAL, MULTI-DOSE in 1 BOX (69680-113-99... | 1000 ug/mL | 100 | $68.30 | $0.777 | ● Active | CMS + PDAC |
| 70069-0172-10 | cyanocobalamin 1000 ug/mL INJECTION | Somerset | 10 VIAL in 1 CARTON (70069-172-10) / 10 m... | 1000 ug/mL | 100 | $68.30 | $0.777 | ● Active | CMS + PDAC |
| 71288-0301-11 | Cyanocobalamin 1000 ug/mL INJECTION | Meitheal | 10 VIAL, MULTI-DOSE in 1 CARTON (71288-301... | 1000 ug/mL | 100 | $68.30 | $0.777 | ● Active | CMS + PDAC |
| 00143-9619-01 | Cyanocobalamin 1000 ug/mL INJECTION | Hikma | 30 mL in 1 VIAL, MULTI-DOSE (0143-9619-01) | 1000 ug/mL | 30 | $20.49 | $0.794 | ● Active | CMS ASP |
| 00517-0130-01 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | American | 1 VIAL, MULTI-DOSE in 1 BOX (0517-0130-01)... | 1000 ug/mL | 30 | $20.49 | $0.794 | ● Active | CMS ASP |
| 71288-0302-30 | Cyanocobalamin 1000 ug/mL INJECTION | Meitheal | 1 VIAL, MULTI-DOSE in 1 CARTON (71288-302-... | 1000 ug/mL | 30 | $20.49 | $0.794 | ● Active | CMS + PDAC |
| 69680-0121-30 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | Vitruvias | 1 VIAL, MULTI-DOSE in 1 BOX (69680-121-30)... | 1000 ug/mL | 1 | $0.68 | $0.794 | ● Active | PDAC |
| 70710-1664-06 | cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | Zydus | 10 VIAL, MULTI-DOSE in 1 CARTON (70710-166... | 1000 ug/mL | 100 | $68.30 | $0.819 | ● Active | CMS + PDAC |
| 70710-1663-07 | cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | Zydus | 25 VIAL, MULTI-DOSE in 1 CARTON (70710-166... | 1000 ug/mL | 25 | $17.08 | $1.491 | ● Active | CMS + PDAC |
| 00143-9621-25 | Cyanocobalamin 1000 ug/mL INJECTION | Hikma | 25 VIAL in 1 BOX (0143-9621-25) / 1 mL in... | 1000 ug/mL | 25 | $17.08 | $1.494 | ● Active | CMS ASP |
| 00517-0031-25 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | American | 25 VIAL, MULTI-DOSE in 1 TRAY (0517-0031-2... | 1000 ug/mL | 25 | $17.08 | $1.494 | ● Active | CMS + PDAC |
| 25021-0502-01 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | Sagent | 25 VIAL in 1 CARTON (25021-502-01) / 1 mL... | 1000 ug/mL | 25 | $17.08 | $1.494 | ● Active | CMS + PDAC |
| 63323-0044-01 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | Fresenius | 25 VIAL, MULTI-DOSE in 1 TRAY (63323-044-0... | 1000 ug/mL | 25 | $17.08 | $1.494 | ● Active | CMS + PDAC |
| 63323-0044-44 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | Fresenius | 25 VIAL, MULTI-DOSE in 1 TRAY (63323-044-4... | 1000 ug/mL | 25 | $17.08 | $1.494 | ● Active | CMS + PDAC |
| 68001-0542-60 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | BluePoint | 25 VIAL, MULTI-DOSE in 1 TRAY (68001-542-6... | 1000 ug/mL | 25 | $17.08 | $1.494 | ● Active | CMS + PDAC |
| 68001-0640-60 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | BluePoint | 25 VIAL in 1 CARTON (68001-640-60) / 1 mL... | 1000 ug/mL | 25 | $17.08 | $1.494 | ● Active | CMS + PDAC |
| 69680-0112-25 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | Vitruvias | 25 VIAL in 1 BOX (69680-112-25) / 1 mL in... | 1000 ug/mL | 25 | $17.08 | $1.494 | ● Active | CMS + PDAC |
| 70069-0005-10 | cyanocobalamin 1000 ug/mL INJECTION | Somerset | 25 VIAL in 1 CARTON (70069-005-10) / 1 mL... | 1000 ug/mL | 25 | $17.08 | $1.494 | ● Active | CMS + PDAC |
| 70756-0635-25 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | Lifestar | 25 VIAL in 1 CARTON (70756-635-25) / 1 mL... | 1000 ug/mL | 25 | $17.08 | $1.494 | ● Active | CMS + PDAC |
| 71288-0300-02 | Cyanocobalamin 1000 ug/mL INJECTION | Meitheal | 25 VIAL, MULTI-DOSE in 1 CARTON (71288-300... | 1000 ug/mL | 25 | $17.08 | $1.494 | ● Active | CMS + PDAC |
| 71288-0303-02 | Cyanocobalamin 1000 ug/mL INJECTION | Meitheal | 25 VIAL, MULTI-DOSE in 1 CARTON (71288-303... | 1000 ug/mL | 25 | $17.08 | $1.494 | ● Active | CMS + PDAC |
| 71288-0303-92 | Cyanocobalamin 1000 ug/mL INJECTION | Meitheal | 25 VIAL, MULTI-DOSE in 1 CARTON (71288-303... | 1000 ug/mL | 25 | $17.08 | $1.494 | ● Active | CMS + PDAC |
| 72603-0650-25 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | NorthStar | 25 VIAL in 1 CARTON (72603-650-25) / 1 mL... | 1000 ug/mL | 25 | $17.08 | $1.494 | ● Active | CMS + PDAC |
| 70512-0840-25 | Cyanocobalamin 1000 ug/mL INJECTION | SOLA | 25 VIAL, MULTI-DOSE in 1 CARTON (70512-840... | 1000 ug/mL | 1 | $0.68 | $1.494 | ● Active | PDAC |
| 70710-1664-07 | cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | Zydus | 25 VIAL, MULTI-DOSE in 1 CARTON (70710-166... | 1000 ug/mL | 250 | $170.75 | $1.973 | ● Active | CMS + PDAC |
| 00517-0032-25 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | American | 25 VIAL, MULTI-DOSE in 1 TRAY (0517-0032-2... | 1000 ug/mL | 250 | $170.75 | $2.134 | ● Active | CMS + PDAC |
| 55150-0364-25 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | AuroMedics | 25 VIAL, MULTI-DOSE in 1 CARTON (55150-364... | 1000 ug/mL | 1 | $0.68 | $2.474 | ● Active | PDAC |
| 69680-0112-10 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | Vitruvias | 10 VIAL in 1 BOX (69680-112-10) / 1 mL in... | 1000 ug/mL | 10 | $6.83 | $2.909 | ● Active | CMS + PDAC |
| 00404-9783-30 | CYANOCOBALAMIN 1000 ug/mL INJECTION, SOLUTION | Henry | 1 VIAL, MULTI-DOSE in 1 BAG (0404-9783-30)... | 1000 ug/mL | 30 | $20.49 | — | ● Active | CMS ASP |
| 00404-9786-10 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | Henry | 1 VIAL, MULTI-DOSE in 1 BAG (0404-9786-10)... | 1000 ug/mL | 10 | $6.83 | — | ● Active | CMS ASP |
| 00404-9840-10 | Cyanocobalamin | Henry | — | — | 10 | $6.83 | — | — | CMS ASP |
| 00404-9995-30 | Cyanocobalamin | Henry | — | — | 30 | $20.49 | — | — | CMS ASP |
| 16714-0302-10 | Cyanocobalamin | Northstar | — | — | 100 | $68.30 | — | — | CMS + PDAC |
| 50090-2709-00 | Cyanocobalamin | A-S | — | — | 25 | $17.08 | — | — | CMS ASP |
| 50090-6229-00 | Cyanocobalamin 1000 ug/mL INJECTION, SOLUTION | A-S | 25 VIAL in 1 BOX (50090-6229-0) / 1 mL in... | 1000 ug/mL | 25 | $17.08 | — | ● Active | CMS ASP |
| 51662-1394-01 | CYANOCOBALAMIN 1000 ug/mL INJECTION | HF | 30 mL in 1 VIAL, MULTI-DOSE (51662-1394-1) | 1000 ug/mL | 30 | $20.49 | — | ● Active | CMS ASP |
| 51662-1647-03 | CYANOCOBALAMIN 1000 ug/mL INJECTION, SOLUTION | HF | 25 POUCH in 1 CASE (51662-1647-3) / 1 VIA... | 1000 ug/mL | 25 | $17.08 | — | ● Active | CMS ASP |
| 67457-0400-05 | Cyanocobalamin | Mylan | — | — | 150 | $102.45 | — | — | CMS + PDAC |
| 68001-0640-59 | CYANOCOBALAMIN 1000 MCG/1 ML | Unknown | — | — | 1 | $0.68 | — | — | PDAC |
| 70756-0635-81 | CYANOCOBALAMIN MDV 1000 MCG/1 ML | Unknown | — | — | 1 | $0.68 | — | — | PDAC |
| 70512-0840-01 | CYANOCOBALAMIN (MDV) 1000 MCG/1 ML | Unknown | — | — | 1 | $0.68 | — | — | PDAC |
| 00517-0031-01 | CYANOCOBALAMIN 1000 MCG/1 ML | Unknown | — | — | 1 | $0.68 | — | — | PDAC |
| 51927-1662-00 | CYANOCOBALAMIN (USP) | Unknown | — | — | 1,000 | $683.00 | — | — | PDAC |
| 51552-1045-09 | CYANOCOBALAMIN (1X500MG,USP) | Unknown | — | — | 1,000 | $683.00 | — | — | PDAC |
| 51552-1045-01 | CYANOCOBALAMIN (1X1GM,USP) | Unknown | — | — | 1,000 | $683.00 | — | — | PDAC |
| 38779-0468-06 | CYANOCOBALAMIN (U.S.P.) | Unknown | — | — | 1,000 | $683.00 | — | — | PDAC |
| 38779-0468-05 | CYANOCOBALAMIN (U.S.P.) | Unknown | — | — | 1,000 | $683.00 | — | — | PDAC |
| 38779-0468-04 | CYANOCOBALAMIN (U.S.P.) | Unknown | — | — | 1,000 | $683.00 | — | — | PDAC |
| 38779-0468-03 | CYANOCOBALAMIN (U.S.P.) | Unknown | — | — | 1,000 | $683.00 | — | — | PDAC |
| 62991-1039-03 | CYANOCOBALAMIN (U.S.P.) | Unknown | — | — | 1,000 | $683.00 | — | — | PDAC |
| 62991-1039-02 | CYANOCOBALAMIN (U.S.P.) | Unknown | — | — | 1,000 | $683.00 | — | — | PDAC |
| 16714-0609-05 | CYANOCOBALAMIN (LATEX-FREE) 1000 MCG/1 ML | Unknown | — | — | 1 | $0.68 | — | — | PDAC |
| 16714-0165-25 | CYANOCOBALAMIN (LATEX-FREE) 1000 MCG/1 ML | Unknown | — | — | 1 | $0.68 | — | — | PDAC |
| 16729-0533-10 | DODEX (MDV) 1000 MCG/1 ML | Unknown | — | — | 1 | $0.68 | — | — | PDAC |
| 16729-0533-08 | DODEX (MDV) 1000 MCG/1 ML | Unknown | — | — | 1 | $0.68 | — | — | PDAC |
| 16729-0533-03 | DODEX (MDV) 1000 MCG/1 ML | Unknown | — | — | 1 | $0.68 | — | — | PDAC |
| 68001-0509-60 | CYANOCOBALAMIN (LATEX-FREE) 1000 MCG/1 ML | Unknown | — | — | 1 | $0.68 | — | — | PDAC |
| 67457-0399-25 | CYANOCOBALAMIN 1000 MCG/1 ML | Unknown | — | — | 1 | $0.68 | — | — | PDAC |
NDC→HCPCS mappings come from the CMS ASP NDC-HCPCS crosswalk; additional DME MAC / DMEPOS mappings come from PDAC and are labeled separately. NADAC from CMS (weekly). “Status” reflects the product's marketing / obsolete flag in the NDC directory. Presence or absence here does not determine Medicare coverage. Linked NDCs open the full product page.
📊 Medicare utilization & spend CMS · PART B · 2026 (Q1)
Period
Total Part B spend
$219.2K
Claims
343,052
Beneficiaries
171,340
Spend / beneficiary
$1.28
Spend / claim
$0.64
Trend by period
Where J3420 ranks among Part B drugs · 2026 (Q1) · neighbors ±5
Total spending — #518 of 824
#513
CYCLOPHOSPHAMIDE(J85... J8530
$233.2K
#514
LEUKINE J2820
$227.5K
#515
OPTISON Q9956
$225.5K
#516
BRIXADI(J0578) J0578
$220.9K
#517
XWRAP DUAL, PER SQ C... Q4358
$220.2K
#518
CYANOCOBALAMIN INJEC... J3420
$219.2K
#519
ALBUKED-25(P9046)* P9046
$215K
#520
PRIMATRIX** Q4110
$215K
#521
PEMETREXED DISODIUM(... J9294
$212.3K
#522
BENDAMUSTINE HCL* J9033
$211.3K
#523
HYCAMTIN J8705
$208.5K
Total claims — #5 of 824
#1
KENALOG-10* J3301
813,059
#2
DEXAMETHASONE SODIUM... J1100
455,323
#3
KETOROLAC TROMETHAMI... J1885
440,857
#4
DEPO-MEDROL* J1010
417,801
#5
CYANOCOBALAMIN INJEC... J3420
343,052
#6
FLUZONE HIGH-DOSE * 90662
321,400
#7
IODIXANOL(Q9967)* Q9967
289,727
#8
PROLIA* J0897
260,340
#9
COMIRNATY * 91320
259,929
#10
VABYSMO J2777
242,296
#11
PREVNAR 20 90677
225,730
Top Medicare Part B drugs by the selected metric. Click any drug to open its J-code page. Source: CMS Medicare Quarterly Part B Spending by Drug.
Full breakdown by period (2)
| Period | Total spend | Beneficiaries | Claims | $/beneficiary | $/claim |
|---|---|---|---|---|---|
| 2026 (Q1) | $219.2K | 171,340 | 343,052 | $1.28 | $0.64 |
| 2025 (Q1-Q4) | $1.43M | 360,124 | 1,519,926 | $3.98 | $0.94 |
Provider-administered (Part B) spend, calculated for the whole HCPCS code (CMS does not publish Medicare spend per individual NDC). Self-administered use is covered under Part D instead. A blank patient count means fewer than 11 people — CMS hides counts that small to protect privacy. Source: CMS Medicare Quarterly Part B Spending by Drug (data.cms.gov), updated quarterly.
📈 Medicare Part B claims detail CMS PSPS · 2024
Calendar-year 2024 Medicare Part B fee-for-service activity for this HCPCS code, summed across all carriers, localities and specialties (CMS Physician/Supplier Procedure Summary). A “service” is one billed line/unit — not one claim — so counts run higher than claim counts.
Allowed charges
$1.45M
Medicare paid
$984.7K
Submitted services
1,799,266
Denial rate
15.4%
Allowed / service
$0.95
Submitted charges
$25.01M
Source: CMS Physician/Supplier Procedure Summary (PSPS), CY2024 — Medicare Part B carrier + DME fee-for-service claims (excludes Medicare Advantage). Figures are for the whole HCPCS code, which may cover uses beyond this drug. ⚠ CMS hides any figure covering fewer than 11 patients (a privacy rule), so totals — especially denials and low-volume codes — run a little low.
🗺️ Where J3420 is utilized CMS · BY PROVIDER · 2024
Medicare Part B services for this code by the rendering provider's state — 921,903 services across 54 states & territories in 2024 (CMS reports include DC and U.S. territories). Switch to per 100k to compare states fairly regardless of population. Hover or tap a state for its top ZIP codes.
Hover or tap a state to see its numbers + top ZIP codes.
Per-capita = services ÷ 2023 state population × 100,000 (so high-population states aren't automatically "hotter"). Counts reflect the provider's location, not the patient's. Providers with fewer than 11 patients are hidden by CMS for privacy, so totals run low and per-100k can be noisy in small states — read this as relative geography, not exact counts. Source: CMS Medicare Physician & Other Practitioners — by Provider and Service, 2024.
📊 What bills under J3420
J-codes are billing codes often used for drugs billed under the medical benefit. This connects the billing code to the NDC package records it covers, by ingredient and labeler.
NDC products by ingredient
NDC products by labeler
🗃️ Data sources & freshness
Every figure on this page is computed from public datasets. Here's what each section draws on and how current it is.
HCPCS code & descriptor
CMS HCPCS Level II code file
Loaded
Payment limit & billing unit
CMS Medicare Part B ASP Pricing File (quarterly)
Q3 2026 · as of 2026-08-20
NDC ↔ HCPCS crosswalk
CMS ASP NDC-HCPCS crosswalk + DMEPDAC (PDAC)
65 NDCs mapped
NADAC acquisition cost
CMS National Average Drug Acquisition Cost (weekly)
Available for mapped NDCs
Utilization & spend
CMS Part B Spending by Drug · PSPS · Physician & Other Practitioners
Latest data year 2026
Figures are estimates for reference and may lag the source files. Always verify against the current CMS files and your payer's policy before submitting claims.
⚠️ Practical billing caveats
- A crosswalk is not coverage. An NDC mapping or a published payment limit does not guarantee a payer will cover or pay this code. Check the specific plan's policy.
- Units ≠ milligrams. Bill the number of HCPCS units (dose ÷ the code's unit size), not the milligram dose. Use the calculator above.
- Discarded drug. For single-dose vials, drug discarded after administration may be separately billable with modifier JW (and JZ when nothing is discarded) where the payer allows.
- Rounding & partial units. Many payers require whole units; round per the payer's policy, not automatically up.
- The code can cover more than this drug. Some HCPCS codes span multiple products or strengths — confirm the exact code for the product administered.
- Figures lag. ASP limits change quarterly and utilization data are released with a delay. Verify against the current CMS files before billing.
❓ J3420 billing FAQ
What is HCPCS code J3420?
J3420 is a HCPCS Level II J-code used to bill Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg under Medicare Part B and most medical (not pharmacy) benefits.
What is the billing unit for J3420?
One unit of J3420 represents 1000 MCG. Report the number of units equal to the dose administered divided by 1000 MCG.
How many units of J3420 should I bill?
Divide the dose administered by the code's unit size (1000 MCG) to get the number of billing units, then round per your payer's policy. The calculator on this page converts a dose into billing units and projects a full course.
How much does Medicare pay for J3420?
The Medicare Part B payment limit is $0.683 per unit (Q3 2026), based on ASP + 6%. After the 2% sequester the effective payment is about $0.669 per unit. Payment limits are revised quarterly.
Which NDCs bill under J3420?
65 NDCs currently map to J3420 in the CMS ASP NDC-HCPCS crosswalk. See the NDC crosswalk table above for each product, package, billing units and estimated reimbursement.
Does a crosswalk mean J3420 is covered?
No. An NDC-to-HCPCS crosswalk and a published payment limit do not guarantee coverage or payment. Coverage depends on the payer, the diagnosis and the site of care — always verify the current policy before billing.
For professional billing reference only — verify against the current CMS files before submitting claims.