ICD-10-CM 2027
ICD-10 code for hip osteoarthritis
From the official ICD-10-CM alphabetic index entry “Osteoarthritis › hip”. Page updated September 29, 2026.
About coding hip osteoarthritis
The ICD-10-CM code for hip osteoarthritis is M16.9 (Osteoarthritis of hip, unspecified). The official index lists 13 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M16.9.
Within M16, choose M16.9 (unspecified) only when documentation doesn't support a more specific option: bilateral primary osteoarthritis of hip (M16.0), unilateral primary osteoarthritis of hip (M16.1), bilateral osteoarthritis resulting from hip dysplasia (M16.2), unilateral osteoarthritis resulting from hip dysplasia (M16.3), bilateral post-traumatic osteoarthritis of hip (M16.4), unilateral post-traumatic osteoarthritis of hip (M16.5), other bilateral secondary osteoarthritis of hip (M16.6) and other unilateral secondary osteoarthritis of hip (M16.7).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 553 (Bone Diseases and Arthropathies with MCC, relative weight 1.2494) and DRG 554 (Bone Diseases and Arthropathies without MCC, relative weight 0.8331), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific hip osteoarthritis codes (official index)
- bilateral M16.0 — Bilateral primary osteoarthritis of hip
- due to hip dysplasia M16.2 — Bilateral osteoarthritis resulting from hip dysplasia
- post-traumatic M16.4 — Bilateral post-traumatic osteoarthritis of hip
- secondary M16.6 — Other bilateral secondary osteoarthritis of hip
- due to hip dysplasia (unilateral) M16.3 — Unilateral osteoarthritis resulting from hip dysplasia
- bilateral M16.2 — Bilateral osteoarthritis resulting from hip dysplasia
- post-traumatic
- primary M16.1 — Unilateral primary osteoarthritis of hip
- bilateral M16.0 — Bilateral primary osteoarthritis of hip
- secondary
- unilateral M16.1 — Unilateral primary osteoarthritis of hip
- due to hip dysplasia M16.3 — Unilateral osteoarthritis resulting from hip dysplasia
- post-traumatic M16.5 — Unilateral post-traumatic osteoarthritis of hip
- primary M16.1 — Unilateral primary osteoarthritis of hip
- secondary NEC M16.7 — Other unilateral secondary osteoarthritis of hip
Common questions about hip osteoarthritis ICD-10 codes
What is the ICD-10 code for hip osteoarthritis?
- M16.9 — Osteoarthritis of hip, unspecified. More specific codes apply when the documentation supports them: M16.0, M16.2, M16.4, M16.6 and others below.
What is the ICD-10 code for bilateral hip osteoarthritis?
- M16.0 — Bilateral primary osteoarthritis of hip.
What is the ICD-10 code for primary hip osteoarthritis?
- M16.1 — Unilateral primary osteoarthritis of hip (header code; choose a more specific subcode).
What is the ICD-10 code for unilateral hip osteoarthritis?
- M16.1 — Unilateral primary osteoarthritis of hip (header code; choose a more specific subcode).
Is M16.9 billable?
- Yes. M16.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M16.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M16.9 as a principal diagnosis.
Is M16.9 a CC or MCC?
- No. M16.9 is neither a CC nor an MCC under MS-DRG v44.0.