J1642
J1642 – Injection, heparin sodium, (heparin lock flush), per 10 units · NDC Crosswalk & Billing Units
HCPCS Level II J-code · Medicare Part B drug billing
J-code
● 32 NDCs crosswalked per 10 UNITS $0.018/unit ASP+6%
📋 J1642 summary
J1642 is a HCPCS Level II J-code used to bill heparin sodium, (heparin lock flush), per 10 units, billed per 10 UNITS. 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 J1642: Heparin Flush
Code J1642
Billing unit 10 UNITS Payment limit $0.018/unit NDC-Crosswalk 32
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 codeJ1642
DescriptorInjection, heparin sodium, (heparin lock flush), per 10 units
Billing unit10 UNITS
Payment limit / unit$0.018
Est. ASP / unit$0.017 est.
Mapped NDCs32
Data periodQ3 2026
Last updated2026-08-20
🧾 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
$0.018
Est. ASP / unit
$0.017 est.
Est. after 2% sequester
$0.018
HCPCS dosage
10 UNITS
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, heparin sodium, (heparin lock flush), per 10 units
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 added1995-01-01
Source: CMS HCPCS Level II code file (imported via admin).
🧮 Dosing & billing-units calculator HCPCS UNITS
One billing unit of J1642 = 10 units. 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 J1642 WITH EST. MEDICARE PAY
32 NDCs map to J1642. Bill units = how many HCPCS units one package represents. Est. pay / pkg = payment limit ($0.018/unit) × that package's bill units.
| NDC (11-digit) | Drug | Labeler | Package | Strength | Bill units | Est. pay / pkg | NADAC / unit | Status | Source |
|---|---|---|---|---|---|---|---|---|---|
| 64253-0222-21 | Heparin (Porcine) Lock Flush | Medefil, | — | — | 60 | $1.08 | — | — | CMS + PDAC |
| 64253-0222-23 | Heparin (Porcine) Lock Flush | Medefil, | — | — | 180 | $3.24 | — | — | CMS ASP |
| 64253-0222-33 | Heparin (Porcine) Lock Flush | Medefil, | — | — | 180 | $3.24 | — | — | CMS ASP |
| 64253-0222-35 | Heparin (Porcine) Lock Flush | Medefil, | — | — | 300 | $5.40 | — | — | CMS + PDAC |
| 64253-0333-21 | Heparin (Porcine) Lock Flush | Medefil, | — | — | 600 | $10.80 | — | — | CMS ASP |
| 64253-0333-23 | Heparin (Porcine) Lock Flush | Medefil, | — | — | 1,800 | $32.40 | — | — | CMS ASP |
| 64253-0333-33 | Heparin (Porcine) Lock Flush | Medefil, | — | — | 1,800 | $32.40 | — | — | CMS + PDAC |
| 64253-0333-35 | Heparin (Porcine) Lock Flush | Medefil, | — | — | 3,000 | $54.00 | — | — | CMS + PDAC |
| 64253-0444-22 | Heparin (Porcine) Lock Flush | Medefil, | — | — | 12 | $0.22 | — | — | CMS ASP |
| 64253-0444-25 | Heparin (Porcine) Lock Flush | Medefil, | — | — | 30 | $0.54 | — | — | CMS ASP |
| 00409-1280-32 | HEPARIN LOCK FLUSH (LUER LOCK,LATEX-FREE) 10 U/ML | Unknown | — | — | 1 | $0.02 | — | — | PDAC |
| 00409-1280-33 | HEPARIN LOCK FLUSH (LUER LOCK,LATEX-FREE) 10 U/ML | Unknown | — | — | 1 | $0.02 | — | — | PDAC |
| 00409-1281-31 | HEPARIN LOCK FLUSH (LUER LOCK,50X1ML) 100 U/ML | Unknown | — | — | 10 | $0.18 | — | — | PDAC |
| 00409-1281-32 | HEPARIN LOCK FLUSH (LUER LOCK,CARPUJECT) 100 U/ML | Unknown | — | — | 10 | $0.18 | — | — | PDAC |
| 00409-1281-33 | HEPARIN LOCK FLUSH (LUER LOCK,25X3ML) 100 U/ML | Unknown | — | — | 10 | $0.18 | — | — | PDAC |
| 00409-1281-35 | HEPARIN LOCK FLUSH (LUER LOCK,CARPUJECT) 100 U/ML | Unknown | — | — | 10 | $0.18 | — | — | PDAC |
| 00409-1280-31 | HEPARIN LOCK FLUSH (LUER LOCK,LATEX-FREE) 10 U/ML | Unknown | — | — | 1 | $0.02 | — | — | PDAC |
| 00409-1280-35 | HEPARIN LOCK FLUSH (LUER LOCK,LATEX-FREE) 10 U/ML | Unknown | — | — | 1 | $0.02 | — | — | PDAC |
| 63807-0400-35 | HEPARIN LOCK FLUSH (USP,3MLX100,PF) 2 U/ML | Unknown | — | — | 0.2 | $0.00 | — | — | PDAC |
| 63807-0500-51 | HEPARIN LOCK FLUSH (LATEX-FREE) 10 U/ML | Unknown | — | — | 1 | $0.02 | — | — | PDAC |
| 63807-0500-31 | HEPARIN LOCK FLUSH (LATEX-FREE) 10 U/ML | Unknown | — | — | 1 | $0.02 | — | — | PDAC |
| 63807-0400-31 | HEPARIN LOCK FLUSH (LATEX-FREE) 2 U/ML | Unknown | — | — | 0.2 | $0.00 | — | — | PDAC |
| 63807-0600-31 | HEPARIN LOCK FLUSH (LATEX-FREE) 100 U/ML | Unknown | — | — | 10 | $0.18 | — | — | PDAC |
| 63807-0600-51 | HEPARIN LOCK FLUSH (LATEX-FREE) 100 U/ML | Unknown | — | — | 10 | $0.18 | — | — | PDAC |
| 63807-0600-55 | HEPARIN LOCK FLUSH 100 U/ML | Unknown | — | — | 10 | $0.18 | — | — | PDAC |
| 63323-0545-05 | HEPARIN LOCK FLUSH (M.D.V.) 100 U/ML | Unknown | — | — | 10 | $0.18 | — | — | PDAC |
| 63323-0545-01 | HEPARIN LOCK FLUSH (M.D.V.,P.C.) 100 U/ML | Unknown | — | — | 10 | $0.18 | — | — | PDAC |
| 63323-0544-11 | HEPARIN LOCK FLUSH (M.D.V.) 10 U/ML | Unknown | — | — | 1 | $0.02 | — | — | PDAC |
| 63323-0544-01 | HEPARIN LOCK FLUSH (M.D.V.,P.C.) 10 U/ML | Unknown | — | — | 1 | $0.02 | — | — | PDAC |
| 63323-0017-10 | HEPFLUSH-10 (S.D.V.,PF) 10 U/ML | Unknown | — | — | 1 | $0.02 | — | — | PDAC |
| 08166-1110-03 | VASCEZE HEPARIN LOCK FLUSH (LUER SLIP NOZZLE,PF) 10 U/ML | Unknown | — | — | 1 | $0.02 | — | — | PDAC |
| 08166-1100-03 | VASCEZE HEPARIN LOCK FLUSH (LUER SLIP NOZZLE) 100 U/ML | Unknown | — | — | 10 | $0.18 | — | — | 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
$4K
Claims
1,162
Beneficiaries
494
Spend / beneficiary
$8.06
Spend / claim
$3.43
Trend by period
Where J1642 ranks among Part B drugs · 2026 (Q1) · neighbors ±5
Total spending — #715 of 824
#710
DELESTROGEN* J1380
$5.1K
#711
SYNOJOYNT, INJ., 1 M... J7331
$4.5K
#712
FUROSEMIDE(J1938) J1938
$4.2K
#713
AMIKACIN SULFATE J0278
$4.2K
#714
CLOFARABINE* J9027
$4.1K
#715
HEPARIN FLUSH J1642
$4K
#716
DIAZEPAM J3360
$3.9K
#717
COMIRNATY (5-11Y)* 91319
$3.8K
#718
ERAXIS J0348
$3.8K
#719
ACETAMINOPHEN(J0131) J0131
$3.7K
#720
VASOPRESSIN-0.9% NAC... J2601
$3.7K
Total claims — #362 of 824
#357
PULMOZYME J7639
1,187
#358
BELRAPZO* J9036
1,180
#359
THYROGEN J3240
1,175
#360
ELREXFIO J1323
1,174
#361
HYDROXOCOBALAMIN J3425
1,171
#362
HEPARIN FLUSH J1642
1,162
#363
ATIVAN* J2060
1,154
#364
LUPRON DEPOT-PED* J1950
1,142
#365
NUSHIELD 1 SQUARE CM... Q4160
1,119
#366
CEFTAZIDIME* J0713
1,095
#367
RYSTIGGO J9333
1,074
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) | $4K | 494 | 1,162 | $8.06 | $3.43 |
| 2025 (Q1-Q4) | $19K | 1,146 | 5,668 | $16.54 | $3.34 |
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
$4.2K
Medicare paid
$3.2K
Submitted services
2,664,847
Denial rate
91.2%
Allowed / service
$0.02
Submitted charges
$1.94M
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 J1642 is utilized CMS · BY PROVIDER · 2024
Medicare Part B services for this code by the rendering provider's state — 283,739 services across 7 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.
🗃️ 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)
32 NDCs mapped
NADAC acquisition cost
CMS National Average Drug Acquisition Cost (weekly)
Not 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.
❓ J1642 billing FAQ
What is HCPCS code J1642?
J1642 is a HCPCS Level II J-code used to bill Injection, heparin sodium, (heparin lock flush), per 10 units under Medicare Part B and most medical (not pharmacy) benefits.
What is the billing unit for J1642?
One unit of J1642 represents 10 UNITS. Report the number of units equal to the dose administered divided by 10 UNITS.
How many units of J1642 should I bill?
Divide the dose administered by the code's unit size (10 UNITS) 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 J1642?
The Medicare Part B payment limit is $0.018 per unit (Q3 2026), based on ASP + 6%. After the 2% sequester the effective payment is about $0.018 per unit. Payment limits are revised quarterly.
Which NDCs bill under J1642?
32 NDCs currently map to J1642 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 J1642 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.