ICD-10 Code G90.51 – Complex regional pain syndrome I of upper limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G90.51 – Complex regional pain syndrome I of upper limb
What it is
G90.51 identifies complex regional pain syndrome type I affecting the upper limb. It describes persistent regional pain with autonomic or sensory changes after injury, without confirmed nerve damage.
Clinical signs
Typical findings include disproportionate pain, swelling, color or temperature changes, and altered sweating in the affected arm or hand. Clinical features vary; refer to documentation.
When to use this code
Use G90.51 when the record clearly documents CRPS type I in the upper extremity, such as the arm, forearm, wrist, or hand. Code it when the provider links the syndrome to the affected limb and no nerve lesion is documented.
If the note only says chronic pain, neuropathy, or post-traumatic pain, this code may not be appropriate. Check documentation for the specific diagnosis and limb involved.
Do not use for
Do not use this code for CRPS type II, which is associated with nerve injury, or for lower-limb CRPS. Do not assign it when the documentation does not specify upper-limb involvement.
Coding tip
Look for the exact phrase “complex regional pain syndrome type I” and the affected upper limb before assigning G90.51.