ICD-10-CM Code for Psoriatic Arthritis
The ICD-10-CM codes for psoriatic arthritis are M07.0-M07.3 (for site-specific psoriatic arthropathy) and L40.5 (for arthropathic psoriasis).
Specific Code Breakdown
The coding system distinguishes psoriatic arthritis by anatomical location:
- M07.0 - Distal interphalangeal psoriatic arthropathy
- M07.1 - Arthritis mutilans
- M07.2 - Psoriatic spondylitis
- M07.3 - Other psoriatic arthropathy
- L40.5 - Arthropathic psoriasis (general code)
Clinical Context and Validation
These codes have been validated in real-world clinical practice. In the Swedish National Patient Register, rheumatologist-assigned ICD-10 diagnoses using these codes demonstrated 69-82% positive predictive value for meeting CASPAR classification criteria and 86% for meeting any established PsA classification criteria 1. French national health insurance data similarly used the M07 code series to identify PsA patients, establishing a prevalence of 0.1% in the general population 2.
Documentation Requirements
For accurate coding, clinical documentation must include:
- Musculoskeletal assessment: Tender/swollen joint counts, presence of dactylitis, enthesitis evaluation, and axial involvement
- Cutaneous manifestations: Extent and location of psoriatic skin lesions
- Nail involvement: Pitting, onycholysis, or other nail changes
Studies demonstrate that PsA specialists document these domains significantly more consistently than general rheumatologists (P < 0.001 for joint counts and skin assessment), which directly impacts coding accuracy 3.
Coding Pitfall
Always code both the musculoskeletal (M07 series) AND dermatologic (L40.5) components when clinically present. PsA combined-clinic specialists more consistently code for both psoriasis and PsA compared to generalists, ensuring complete capture of the disease burden 3.
The M07 series should be selected based on the predominant pattern of joint involvement, while L40.5 captures the underlying psoriatic disease when skin manifestations are present.