M19.91 is the authoritative medical code for Primary osteoarthritis, unspecified site. This classification is used in medical billing and clinical recording to specify the clinical criteria for primary osteoarthritis, unspecified site (ICD-10-CM M19.91), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Sequencing, inclusion, and exclusion notes published for M19.91 in the official ICD-10-CM tabular list.
Alternative terms the tabular list files under this code.
Conditions that can never be reported with this code; the two are mutually exclusive.
Conditions not covered by this code, but which may be reported alongside it when both are present.
Per official ICD-10-CM Excludes1 instructions, M19.91 must not be reported together with: polyarthritis (M15.-).
Per official ICD-10-CM Excludes2 instructions, M19.91 and the following are not considered part of each other and may both be reported when both conditions are present: arthrosis of spine (M47.-); hallux rigidus (M20.2); osteoarthritis of spine (M47.-).
Primary osteoarthritis, unspecified site includes: Primary osteoarthritis NOS.
Official ICD-10-CM classifications closest to M19.91 in its code family, with their registry titles.
Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.