ICD-10-CM 2027
ICD-10 code for psoriatic arthritis
From the official ICD-10-CM alphabetic index entry “Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) › psoriatic”. Page updated September 29, 2026.
About coding psoriatic arthritis
The ICD-10-CM code for psoriatic arthritis is L40.50 (Arthropathic psoriasis, unspecified).
Within L40.5, choose L40.50 (unspecified) only when documentation doesn't support a more specific option: distal interphalangeal psoriatic arthropathy (L40.51), psoriatic arthritis mutilans (L40.52), psoriatic spondylitis (L40.53), psoriatic juvenile arthropathy (L40.54) and other psoriatic arthropathy (L40.59).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 545 (Connective Tissue Disorders with MCC, relative weight 2.3892), DRG 546 (Connective Tissue Disorders with CC, relative weight 1.1745) and DRG 547 (Connective Tissue Disorders without CC/MCC, relative weight 0.7526), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about psoriatic arthritis ICD-10 codes
What is the ICD-10 code for psoriatic arthritis?
- L40.50 — Arthropathic psoriasis, unspecified.
Is L40.50 billable?
- Yes. L40.50 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can L40.50 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict L40.50 as a principal diagnosis.
Is L40.50 a CC or MCC?
- No. L40.50 is neither a CC nor an MCC under MS-DRG v44.0.