Is C41.9 a billable ICD-10-CM code?

Yes. C41.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does C41.9 sit in the tabular list?

Neoplasms (C00-D49), in the block Malignant neoplasms of bone and articular cartilage (C40-C41).

What cannot be coded together with C41.9?

C41.9 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above C41.9 (C41) and apply to it just the same.

C41.9

C41.9 — Malignant neoplasm of bone and articular cartilage, unspecified

Billable / specific codeICD-10-CM

C41.9 is a billable, specific ICD-10-CM code for malignant neoplasm of bone and articular cartilage, unspecified. It is valid for submission on a claim.

Excludes1 inherited from the categories above C41.9

These are not written on C41.9, but they bind it: a note on a category applies to every code beneath it. Billing C41.9 with anything listed here is a denial.

Written on C41 — Malignant neoplasm of bone and articular cartilage of other and unspecified sites

malignant neoplasm of bones of limbs (C40.-)
malignant neoplasm of cartilage of ear (C49.0)
malignant neoplasm of cartilage of eyelid (C49.0)
malignant neoplasm of cartilage of larynx (C32.3)
malignant neoplasm of cartilage of limbs (C40.-)
malignant neoplasm of cartilage of nose (C30.0)

Risk adjustment

C41.9 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 21 Lymphoma and Other Cancers0.671 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.

Medicare coverage

C41.9 is named in 54 Medicare coverage policies — 54 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

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How C41.9 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to C41.9.

Osteitis›deformans›in›malignant neoplasm of bone(see also, Neoplasm, malignant, by site)

Code history

C41.9 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share C41. If C41.9 is not quite right, the correct code is usually one of these.

Questions about C41.9

Is C41.9 a billable ICD-10-CM code?: Yes. C41.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does C41.9 sit in the tabular list?: Neoplasms (C00-D49), in the block Malignant neoplasms of bone and articular cartilage (C40-C41).
What cannot be coded together with C41.9?: C41.9 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above C41.9 (C41) and apply to it just the same.