M13.80 Other specified arthritis, unspecified site

Billable ICD-10-CM code, FY2026.

Applies from M13 Other arthritis

Excludes1 (never code together)

• arthrosis (M15-M19)
• osteoarthritis (M15-M19)

Applies from M13.8 Other specified arthritis

Applicable to

• Allergic arthritis

Excludes1 (never code together)

• osteoarthritis (M15-M19)

MS-DRG index

Defines the logic of DRG(s) 553-554 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 716.20 Allergic arthritis, site unspecified (approximate)

Diagnosis Index entries for M13.80

• Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) › specified form NEC

Nearby codes

• M13.17 Monoarthritis, not elsewhere classified, ankle and foot
• M13.171 Monoarthritis, not elsewhere classified, right ankle and foot
• M13.172 Monoarthritis, not elsewhere classified, left ankle and foot
• M13.179 Monoarthritis, not elsewhere classified, unspecified ankle and foot
• M13.8 Other specified arthritis
• M13.80 Other specified arthritis, unspecified site (this code)
• M13.81 Other specified arthritis, shoulder
• M13.811 Other specified arthritis, right shoulder
• M13.812 Other specified arthritis, left shoulder
• M13.819 Other specified arthritis, unspecified shoulder
• M13.82 Other specified arthritis, elbow