ICD-10 Code G90.59 – Complex regional pain syndrome I of other specified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G90.59 – Complex regional pain syndrome I of other specified site
What it is
G90.59 identifies complex regional pain syndrome type I affecting a site not named elsewhere in the code set. Use it when the record documents CRPS without confirmed nerve injury and the affected location is specifically “other specified.”
Clinical signs
Typical findings include persistent regional pain, tenderness, swelling, color or temperature changes, and altered sweating. Clinical features vary; refer to documentation for the exact site and supporting signs.
When to use this code
Use this code when the clinician documents CRPS type I and the affected area is not captured by a more specific site code. It fits notes describing an unusual limb or regional location with no documented nerve lesion. If the site is unclear, check documentation before coding.
Do not use for
Do not use this code for CRPS type II or when a documented nerve injury changes the diagnosis. Avoid it if the record names a more specific anatomic site or does not clearly support CRPS.
Coding tip
Match the code to both the CRPS type and the documented site; if either is missing, check documentation.