ICDcodes.org
FY2027

M17.1 — Unilateral primary osteoarthritis of knee

Not billable

Is M17.1 billable?

No — M17.1 is a non-billable header code. M17.1 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 3 billable codes beneath M17.1.

M17.1 at a glance

CodeM17.1
DescriptionUnilateral primary osteoarthritis of knee
BillableNo — header code
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

How is M17.1 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to M17.1. They show the wording a clinician may have documented, which often differs from the Tabular description.

  • Osteoarthritis › knee › primary
  • Osteoarthritis › knee › unilateral
  • Osteoarthritis › primary › knee
  • Osteoarthritis › knee › unilateral › primary

Inclusion terms

Alternative wording in documentation that is classified to M17.1.

  • Primary osteoarthritis of knee NOS

Excludes2 — not included here — inherited from Chapter 13

The conditions below are not part of M17.1, but a patient may have both at the same time. When documentation supports it, M17.1 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

The conditions below are not part of M17.1, but a patient may have both at the same time. When documentation supports it, M17.1 and the excluded code may both be reported.

  • osteoarthritis of spine (M47.-)

What codes fall under M17.1? (3)

How long has M17.1 existed?

M17.1 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

Which conditions are coded to M17.1?

What other codes are in the M17 family? (6)