M17.1 – Unilateral primary osteoarthritis of knee
ICD-10-CM 2027 diagnosis code · Osteoarthritis
ICD-10-CM code
M17.1
- Code
M17.1(claims format:M171)- Description
- Unilateral primary osteoarthritis of knee
- 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
- M17
Billable codes under M17.1
M17.1 is a header code and cannot be used on claims. Choose the most specific code:
Notes for M17.1
Applicable to:
- Primary osteoarthritis of knee NOS
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Block M15-M19
Excludes2 (not included here):
- osteoarthritis of spine (M47.-)
Index terms for M17.1
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in M17
- M17.0 – Bilateral primary osteoarthritis of kneeBillable
- M17.2 – Bilateral post-traumatic osteoarthritis of kneeBillable
- M17.3 – Unilateral post-traumatic osteoarthritis of kneeHeader
- M17.4 – Other bilateral secondary osteoarthritis of kneeBillable
- M17.5 – Other unilateral secondary osteoarthritis of kneeBillable
- M17.9 – Osteoarthritis of knee, unspecifiedBillable
Frequently asked questions
What is ICD-10 code M17.1?
M17.1 is the ICD-10-CM code for unilateral primary osteoarthritis of knee, in the block M15-M19 (Osteoarthritis).
Is M17.1 a billable code?
No. M17.1 is a header code with more specific child codes; report one of the billable codes listed above.
What category does M17.1 belong to?
It belongs to category M17 – Osteoarthritis of knee.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.