Quick answer
J9173
What Medicare pays for Imfinzi (2026 Q3)
Once a claim carries a covered diagnosis, Medicare Part B reimburses the drug at the ASP + 6% payment limit. Current allowed amounts per billing unit:
| HCPCS | Description | Per unit | Allowed (ASP + 6%) |
|---|---|---|---|
| J9173 | Inj., durvalumab, 10 mg | 10 mg | $87.950 |
Source: CMS ASP Drug Pricing File, 2026 Q3. Payment = ASP + 6% per unit; multiply by units billed (watch JZ/JW wastage). Your patient's share is typically 20% after the deductible. Estimate the full cost & patient out-of-pocket →
Imfinzi is a physician-administered biologic billed under Medicare Part B (not the Part D pharmacy benefit). Under Part B, Medicare pays the practice for the drug (HCPCS J9173) plus its administration — but only when the claim's diagnosis (ICD-10) code supports medical necessity. Each MAC publishes the specific covered diagnoses in a Billing & Coding Article; a claim with a diagnosis outside that list is typically denied as not medically necessary (CO-50).
Covered ICD-10 diagnoses for Imfinzi
The 11 FDA-approved indications for J9173, grouped by condition — filter to find a code.
NSCLC — 2 diagnoses (applies to J9173)
Neoplasms (2)
| ICD-10 | Covered diagnosis |
|---|---|
| C34.10 | Malignant neoplasm of upper lobe, unspecified bronchus or lung |
| C34.90 | Malignant neoplasm of unspecified part of bronchus or lung |
Urothelial Carcinoma — 1 diagnoses (applies to J9173)
Neoplasms (1)
| ICD-10 | Covered diagnosis |
|---|---|
| C67.9 | Malignant neoplasm of bladder, unspecified |
Hepatocellular — 1 diagnoses (applies to J9173)
Neoplasms (1)
| ICD-10 | Covered diagnosis |
|---|---|
| C22.0 | Liver cell carcinoma |
Biliary Tract — 1 diagnoses (applies to J9173)
Neoplasms (1)
| ICD-10 | Covered diagnosis |
|---|---|
| C25.9 | Malignant neoplasm of pancreas, unspecified |
Encounter — 1 diagnoses (applies to J9173)
Factors influencing health status (1)
| ICD-10 | Covered diagnosis |
|---|---|
| Z51.12 | Encounter for antineoplastic immunotherapy |
Lung Cancer — 2 diagnoses (applies to J9173)
Neoplasms (2)
| ICD-10 | Covered diagnosis |
|---|---|
| C34.00 | Malignant neoplasm of unspecified main bronchus |
| C34.30 | Malignant neoplasm of lower lobe, unspecified bronchus or lung |
Biliary Tract Cancer — 2 diagnoses (applies to J9173)
Neoplasms (2)
| ICD-10 | Covered diagnosis |
|---|---|
| C24.0 | Malignant neoplasm of extrahepatic bile duct |
| C24.9 | Malignant neoplasm of biliary tract, unspecified |
Bladder Cancer — 1 diagnoses (applies to J9173)
Neoplasms (1)
| ICD-10 | Covered diagnosis |
|---|---|
| C67.0 | Malignant neoplasm of trigone of bladder |
How to bill Imfinzi
Put a medically necessary, FDA-indicated diagnosis from the list above on the claim line with J9173. Matching codes, units and JZ/JW wastage →
Which policy governs Imfinzi
No drug-specific LCD or Article — see the note at the top of this page. Find your MAC → What an LCD, an Article and an NCD each govern →
If a claim for Imfinzi is denied
With no drug-specific Article, the usual cause is a diagnosis the MAC does not accept as medically necessary for J9173, or an off-label use with no compendium support. The five denial patterns and how to fix each →
Frequently asked questions
- Is Imfinzi covered by Medicare?
- Yes. Imfinzi (J9173) is covered under Medicare Part B as a physician-administered drug when billed for a medically necessary indication. There is no drug-specific Local Coverage Determination (LCD) for it, so coverage is determined per medical necessity by your MAC; the FDA-approved indications below are the starting point.
- What diagnoses are covered for Imfinzi (J9173)?
- Medicare publishes no drug-specific covered-diagnosis list for J9173. The 11 ICD-10 codes here are the FDA-approved indications; an off-label use needs approved-compendium support (DrugDex, NCCN) to be payable.
- Which Medicare policy covers Imfinzi?
- No drug-specific LCD or Billing & Coding Article exists for Imfinzi. It's covered under the general Medicare Part B drug benefit per medical necessity, as judged by your Medicare Administrative Contractor (MAC).
- Why was my Imfinzi claim denied as not medically necessary?
- The most common cause is a diagnosis the MAC doesn't consider medically necessary for J9173. Bill a covered/FDA-approved indication from the list below, document medical necessity, and confirm any local guidance with your MAC.
Related references
Covered is only half the answer.
You know the diagnosis is payable. Now quote the patient before the visit and catch underpayments: get Imfinzi's exact Medicare allowed amount, your payer's rate vs. ASP+6%, and the patient's out-of-pocket — in about 30 seconds, free.
Estimate Imfinzi cost & patient owe →Source & verification
- Source
- FDA-approved indications (Drugs@FDA labeling) mapped to ICD-10-CM. No drug-specific Medicare LCD/Article exists for Imfinzi — Part B coverage is determined per medical necessity by your MAC.
- Primary sources
- DailyMed — Imfinzi prescribing information · CMS Part B Drug ASP Pricing File — the quarterly payment limit quoted above · CMS Medicare Coverage Database — searched for “Imfinzi”; no drug-specific NCD, LCD or Billing & Coding Article exists, which is why the FDA-indicated codes above are the working list
- Page last reviewed by CareCost
- Aug 23, 2026 (coverage data retrieved 2026-08-26; we re-verify against CMS quarterly).
- Code licensing
- ICD-10-CM codes are public domain (CMS/CDC). CPT® codes are AMA-copyrighted and are intentionally not listed here — see the administration-code reference for those.
- Not advice
- This is general billing reference, not legal or billing advice. Always verify against the LCD/Article that applies to your MAC and patient.
- How we build this
- Compiled programmatically from the CMS Coverage API under a founder-led methodology maintained by Erin Rose (Founder), and reviewed against the source article with a practitioner-correction loop. See our methodology and editorial policy.
- Spotted an error?
- Email editorial@carecostestimate.com.