2026 ICD-10-CM Diagnosis Code G90.523Complex regional pain syndrome I of lower limb, bilateral

ICD-10-CM Codes›G00–G99›G89-G99›G90

ICD-10-CM G90.523
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G90.523 is a billable ICD-10-CM diagnosis code for complex regional pain syndrome I of lower limb, bilateral. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as complex regional pain syndrome of lower limb. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nervous system pain and pain syndromes.

Code Identity

ICD-10-CM Code
G90.523
Billable Status
Yes — Valid for Submission
Code Describes
Complex regional pain syndrome I of lower limb, bilateral
Short Description
Complex regional pain syndrome I of lower limb, bilateral
Same as the full description in the CMS dataset.
Parent Code
G90.52
Complex regional pain syndrome I of lower limb

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG89-G99Other disorders of the nervous system
CategoryG90Disorders of autonomic nervous system
This CodeG90.523Complex regional pain syndrome I of lower limb, bilateral

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Complex regional pain syndrome of lower limb
  • Complex regional pain syndrome type I
  • Complex regional pain syndrome type I of bilateral lower limbs
  • Complex regional pain syndrome type I of left lower limb
  • Complex regional pain syndrome type I of right lower limb

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS019
Nervous system pain and pain syndromes
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Complex Regional Pain Syndrome

Complex regional pain syndrome (CRPS) is a chronic pain condition. It causes intense pain, usually in the arms, hands, legs, or feet. It may happen after an injury, either to a nerve or to tissue in the affected area. Rest and time may only make it worse.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert G90.523 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
337.22 Rflx sym dystrph lwr lmb
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About G90.523Overview

Is G90.523 (Complex regional pain syndrome I of lower limb) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report complex regional pain syndrome I of lower limb, bilateral on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of G90.523?

Under the General Equivalence Mappings, complex regional pain syndrome I of lower limb, bilateral converts to ICD-9-CM 337.22 (rflx sym dystrph lwr lmb). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.