ICD-10 Code for Hip Osteoarthritis

Also searched as osteoarthritis of hip, hip oa

The ICD-10-CM code for hip osteoarthritis depends on the side: M16.11 for the right side, M16.12 for the left, M16.0 for both sides and M16.10 when one side is affected but the record does not say which. M16.9 applies only when the record does not say whether one side or both are affected. If the record documents a more specific type, the code changes — see the qualifiers below. Valid for FY2027.

M16.9 billableLaterality requiredUnspecified

Hip osteoarthritis ICD-10 codes at a glance

Condition	Hip osteoarthritis
Right	M16.11 — Unilateral primary osteoarthritis, right hip
Left	M16.12 — Unilateral primary osteoarthritis, left hip
Bilateral	M16.0 — Bilateral primary osteoarthritis of hip
Unspecified	M16.10 — Unilateral primary osteoarthritis, unspecified hip
Billable	Yes (M16.9)
Alphabetic Index entry	Osteoarthritis, hip
Code set	ICD-10-CM FY2027, valid October 1, 2026 – September 30, 2027

What is the ICD-10 code for right hip osteoarthritis?

The ICD-10-CM code for right hip osteoarthritis is M16.11 — Unilateral primary osteoarthritis, right hip. M16.11 is billable.

What is the ICD-10 code for left hip osteoarthritis?

The ICD-10-CM code for left hip osteoarthritis is M16.12 — Unilateral primary osteoarthritis, left hip. M16.12 is billable.

Is there an ICD-10 code for bilateral hip osteoarthritis?

Yes. The ICD-10-CM code for bilateral hip osteoarthritis is M16.0 — Bilateral primary osteoarthritis of hip. M16.0 is billable.

“When a patient has a bilateral condition and each side is treated during separate encounters, assign the "bilateral" code (as the condition still exists on both sides), including for the encounter to treat the first side.”
ICD-10-CM Official Guidelines, Section I.B.13

“For the second encounter for treatment after one side has previously been treated and the condition no longer exists on that side, assign the appropriate unilateral code for the side where the condition still exists (e.g., cataract surgery performed on each eye in separate encounters). The bilateral code would not be assigned for the subsequent encounter, as the patient no longer has the condition in the previously-treated site.”
ICD-10-CM Official Guidelines, Section I.B.13

When can the unspecified-side code for hip osteoarthritis be used?

The unspecified-side code for hip osteoarthritis is M16.10 — Unilateral primary osteoarthritis, unspecified hip. M16.10 is billable.

“If the side is not identified in the medical record, assign the code for the unspecified side.”
ICD-10-CM Official Guidelines, Section I.B.13

“Codes for "unspecified" side should rarely be used, such as when the documentation in the record is insufficient to determine the affected side and it is not possible to obtain clarification.”
ICD-10-CM Official Guidelines, Section I.B.13

What changes the hip osteoarthritis code?

The Alphabetic Index lists these qualifiers under Osteoarthritis, hip. If the record documents one of them, the code changes. Verify the code in the Tabular List before reporting it.

bilateral	M16.0	Bilateral primary osteoarthritis of hip
bilateral › due to hip dysplasia	M16.2	Bilateral osteoarthritis resulting from hip dysplasia
bilateral › post-traumatic	M16.4	Bilateral post-traumatic osteoarthritis of hip
bilateral › secondary	M16.6	Other bilateral secondary osteoarthritis of hip
due to hip dysplasia	M16.3-	Unilateral osteoarthritis resulting from hip dysplasia
due to hip dysplasia › bilateral	M16.2	Bilateral osteoarthritis resulting from hip dysplasia
primary	M16.1-	Unilateral primary osteoarthritis of hip
primary › bilateral	M16.0	Bilateral primary osteoarthritis of hip
unilateral	M16.1-	Unilateral primary osteoarthritis of hip
unilateral › due to hip dysplasia	M16.3-	Unilateral osteoarthritis resulting from hip dysplasia
unilateral › post-traumatic	M16.5-	Unilateral post-traumatic osteoarthritis of hip
unilateral › primary	M16.1-	Unilateral primary osteoarthritis of hip
unilateral › secondary NEC	M16.7	Other unilateral secondary osteoarthritis of hip

What does the Tabular List say about M16.9?

The instructional notes that govern M16.9, including those it inherits from its category and chapter. An Excludes1 note means the two codes are never reported together.

Excludes2 — not included here — inherited from Chapter 13

The conditions below are not part of M16.9, but a patient may have both at the same time. When documentation supports it, M16.9 and the excluded code may both be reported.

arthropathic psoriasis (L40.5-)
certain conditions originating in the perinatal period (P04-P96)
certain infectious and parasitic diseases (A00-B99)
compartment syndrome (traumatic) (T79.A-)
complications of pregnancy, childbirth and the puerperium (O00-O9A)
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
endocrine, nutritional and metabolic diseases (E00-E88)
injury, poisoning and certain other consequences of external causes (S00-T88)
neoplasms (C00-D49)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Excludes2 — not included here — inherited from M15-M19