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J9350

J9350 – Injection, mosunetuzumab-axgb, 1 mg · NDC Crosswalk & Billing Units

HCPCS Level II J-code · Medicare Part B drug billing
J-code ● 4 NDCs crosswalked per 1 MG $674.495/unit ASP+6%

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Compiled from public FDA, CMS, DailyMed, NADAC, and related drug data sources. Editorial policy

📋 J9350 summary

J9350 is a HCPCS Level II J-code used to bill mosunetuzumab-axgb, 1 mg, billed per 1 MG. 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 J9350: Lunsumio Velo*, Lunsumio, Lunsumio Velo

Code J9350 Billing unit 1 MG Payment limit $674.495/unit NDC-Crosswalk 4 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 codeJ9350
DescriptorInjection, mosunetuzumab-axgb, 1 mg
Billing unit1 MG
Payment limit / unit$674.495
Est. ASP / unit$636.316 est.
Mapped NDCs4
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
$674.495
Est. ASP / unit
$636.316 est.
Est. after 2% sequester
$661.005
HCPCS dosage
1 MG
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, mosunetuzumab-axgb, 1 mg
CoverageC — Carrier/MAC judgment
Pricing indicator51 — Drug — priced under the ASP methodology
Type of service1 — Medical care
BETOS-2O1D
ASC payment groupYY
Action codeN — No maintenance this year
Effective date2023-07-01
Date added2023-07-01
Source: CMS HCPCS Level II code file (imported via admin).

🧮 Dosing & billing-units calculator HCPCS UNITS

One billing unit of J9350 = 1 mg. 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 J9350 WITH EST. MEDICARE PAY

4 NDCs map to J9350. Bill units = how many HCPCS units one package represents. Est. pay / pkg = payment limit ($674.495/unit) × that package's bill units.
NDC (11-digit)DrugLabelerPackageStrength Bill units Est. pay / pkg NADAC / unit StatusSource
50242-0142-01 Lunsumio Mosunetuzumab 30 mg/30mL CONCENTRATE Genentech, 1 VIAL in 1 CARTON (50242-142-01) / 30 mL... 30 mg/30mL 30 $20,234.85 — ● Active CMS + PDAC
50242-0159-01 Lunsumio Mosunetuzumab 1 mg/mL CONCENTRATE Genentech, 1 VIAL in 1 CARTON (50242-159-01) / 1 mL... 1 mg/mL 1 $674.50 — ● Active CMS + PDAC
50242-0177-01 Lunsumio Velo Mosunetuzumab 5 mg/.5mL INJECTION Genentech, 1 VIAL, GLASS in 1 CARTON (50242-177-01)... 5 mg/.5mL 5 $3,372.48 — ● Active CMS ASP
50242-0201-01 Lunsumio Velo Mosunetuzumab 45 mg/mL INJECTION Genentech, 1 VIAL, GLASS in 1 CARTON (50242-201-01)... 45 mg/mL 45 $30,352.28 — ● Active CMS ASP
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
$11.74M
Claims
615
Beneficiaries
201
Spend / beneficiary
$58,408.01
Spend / claim
$19,089.45
Trend by period
Where J9350 ranks among Part B drugs · 2026 (Q1) · neighbors ±5
Total spending — #166 of 824
#161 VYLOY J1326 $12.35M #162 POSFREA J2468 $12.27M #163 XEMBIFY J1558 $12.01M #164 ALYGLO J1552 $11.88M #165 RITUXAN HYCELA J9311 $11.87M #166 LUNSUMIO VELO* J9350 $11.74M #167 RUXIENCE Q5119 $11.73M #168 SPIKEVAX * 91322 $11.59M #169 OGIVRI Q5114 $11.51M #170 GAMMAGARD S-D J1566 $11.36M #171 TREMFYA ONE-PRESS* J1628 $11.31M
Total claims — #431 of 824
#426 ANKTIVA J9028 638 #427 THERASKIN** Q4121 637 #428 ZYNYZ J9345 623 #429 EPOPROSTENOL SODIUM* J1325 622 #430 VAXNEUVANCE 90671 617 #431 LUNSUMIO VELO* J9350 615 #432 BICILLIN L-A J0561 610 #433 ADAKVEO J0791 605 #434 VEKLURY J0248 604 #435 BRIUMVI J2329 599 #436 MULTIHANCE MULTIPACK A9578 598

Full breakdown by period (2)
PeriodTotal spendBeneficiariesClaims$/beneficiary$/claim
2026 (Q1) $11.74M 201 615 $58,408.01 $19,089.45
2025 (Q1-Q4) $32.76M 273 1,694 $119,982.25 $19,335.98
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
$5.43M
Medicare paid
$4.26M
Submitted services
8,948
Denial rate
3.4%
Allowed / service
$628.43
Submitted charges
$16.97M
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.

📊 What bills under J9350

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
Mosunetuzumab 4
NDC products by labeler
Genentech, Inc. 4

🗃️ 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)
4 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.

❓ J9350 billing FAQ

What is HCPCS code J9350?
J9350 is a HCPCS Level II J-code used to bill Injection, mosunetuzumab-axgb, 1 mg under Medicare Part B and most medical (not pharmacy) benefits.
What is the billing unit for J9350?
One unit of J9350 represents 1 MG. Report the number of units equal to the dose administered divided by 1 MG.
How many units of J9350 should I bill?
Divide the dose administered by the code's unit size (1 MG) 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 J9350?
The Medicare Part B payment limit is $674.495 per unit (Q3 2026), based on ASP + 6%. After the 2% sequester the effective payment is about $661.005 per unit. Payment limits are revised quarterly.
Which NDCs bill under J9350?
4 NDCs currently map to J9350 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 J9350 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.