M16.1 – Unilateral primary osteoarthritis of hip

Code

M16.1 (claims format: M161)

Description

Unilateral primary osteoarthritis of hip

Billable

No – use a more specific code below

Valid for

Dates of service October 1, 2026 – September 30, 2027 (FY2027)

Chapter

13. Diseases of the musculoskeletal system and connective tissue (M00-M99)

Block

M15-M19 Osteoarthritis

Parent codes

M16

Billable codes under M16.1

M16.1 is a header code and cannot be used on claims. Choose the most specific code:

• M16.10 – Unilateral primary osteoarthritis, unspecified hipBillable
• M16.11 – Unilateral primary osteoarthritis, right hipBillable
• M16.12 – Unilateral primary osteoarthritis, left hipBillable

Notes for M16.1

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block M15-M19

Index terms for M16.1

Entries in the ICD-10-CM alphabetic index that lead to this code:

• Osteoarthritis, hip, primary
• Osteoarthritis, primary, hip
• Osteoarthritis, hip, unilateral
• Osteoarthritis, hip, unilateral, primary

Related codes in M16

• M16.0 – Bilateral primary osteoarthritis of hipBillable
• M16.2 – Bilateral osteoarthritis resulting from hip dysplasiaBillable
• M16.3 – Unilateral osteoarthritis resulting from hip dysplasiaHeader
• M16.4 – Bilateral post-traumatic osteoarthritis of hipBillable
• M16.5 – Unilateral post-traumatic osteoarthritis of hipHeader
• M16.6 – Other bilateral secondary osteoarthritis of hipBillable
• M16.7 – Other unilateral secondary osteoarthritis of hipBillable
• M16.9 – Osteoarthritis of hip, unspecifiedBillable