2026 ICD-10-CM Diagnosis Code G90.529Complex regional pain syndrome I of unspecified lower limb

ICD-10-CM Codes›G00–G99›G89-G99›G90

ICD-10-CM G90.529
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G90.529 is a billable ICD-10-CM diagnosis code for complex regional pain syndrome I of unspecified lower limb. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is flagged as an unspecified code, since codes identifying laterality exist in the same family. Coders also document this condition as complex regional pain syndrome of foot. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nervous system pain and pain syndromes.

Code Identity

ICD-10-CM Code
G90.529
Billable Status
Yes — Valid for Submission
Code Describes
Complex regional pain syndrome I of unspecified lower limb
Short Description
Complex regional pain syndrome I of unspecified lower limb
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 CodeG90.529Complex regional pain syndrome I of unspecified lower limb

Code EditsBilling

Medicare Code Editor checks that affect claim validity for G90.529.

Unspecified codes
Unspecified codes exist in the ICD-10-CM classification for circumstances when documentation in the medical record does not provide the level of detail needed to support reporting a more specific code. However, in the inpatient setting, there should generally be very limited and rare circumstances for which the laterality (right, left, bilateral) of a condition is unable to be documented and reported. The following pages contain the list of unspecified ICD-10-CM diagnosis codes for which there is a more specific code to identify laterality (right, left, bilateral) within that code family.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Complex regional pain syndrome of foot
  • Complex regional pain syndrome of knee
  • Complex regional pain syndrome of 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 G90.529 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 G90.529Overview

Is G90.529 (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 unspecified lower limb on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of G90.529?

Under the General Equivalence Mappings, complex regional pain syndrome I of unspecified lower limb 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.