ICD-10-CM 2027
ICD-10 code for psoriatic spondylitis
From the official ICD-10-CM alphabetic index entry “Spondylitis (chronic) › psoriatic”. Page updated September 29, 2026.
About coding psoriatic spondylitis
The ICD-10-CM code for psoriatic spondylitis is L40.53 (Psoriatic spondylitis).
Within L40.5 (Arthropathic psoriasis), L40.53 is specifically for psoriatic spondylitis. Related codes cover unspecified (L40.50), distal interphalangeal psoriatic arthropathy (L40.51), psoriatic arthritis mutilans (L40.52), 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 spondylitis ICD-10 codes
What is the ICD-10 code for psoriatic spondylitis?
- L40.53 — Psoriatic spondylitis.
Is L40.53 billable?
- Yes. L40.53 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can L40.53 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict L40.53 as a principal diagnosis.
Is L40.53 a CC or MCC?
- No. L40.53 is neither a CC nor an MCC under MS-DRG v44.0.