ICD10BillableValid for clinical use
ICD-10 Code G90.529: Complex regional pain syndrome I of unspecified lower limb
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the nervous system (G00-G99).
When is it used?
- May be used when a clinician documents complex regional pain syndrome i of unspecified lower limb in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
Code hierarchy
chapter
6Diseases of the nervous system (G00-G99)
block
G89-G99Other disorders of the nervous system
category
G90Disorders of autonomic nervous system
category
G90.5Complex regional pain syndrome I (CRPS I)
category
G90.52Complex regional pain syndrome I of lower limb
currentG90.52
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
NeurologistGeneral Physician
Related codes
Sibling codes
Coverage-related procedures and services
CPT 64416high
INJECTION(S), ANESTHETIC AGENT(S) AND/OR STEROID; BRACHIAL PLEXUS, CONTINUOUS INFUSION BY CATHETER (INCLUDING CATHETER PLACEMENT), INCLUDING IMAGING GUIDANCE, WHEN PERFORMED
Source: CMS coverage guidance
CPT 64448high
INJECTION(S), ANESTHETIC AGENT(S) AND/OR STEROID; FEMORAL NERVE, CONTINUOUS INFUSION BY CATHETER (INCLUDING CATHETER PLACEMENT), INCLUDING IMAGING GUIDANCE, WHEN PERFORMED
Source: CMS coverage guidance
CPT 64449high
INJECTION(S), ANESTHETIC AGENT(S) AND/OR STEROID; LUMBAR PLEXUS, POSTERIOR APPROACH, CONTINUOUS INFUSION BY CATHETER (INCLUDING CATHETER PLACEMENT)
Source: CMS coverage guidance
CPT 64446high
INJECTION(S), ANESTHETIC AGENT(S) AND/OR STEROID; SCIATIC NERVE, CONTINUOUS INFUSION BY CATHETER (INCLUDING CATHETER PLACEMENT), INCLUDING IMAGING GUIDANCE, WHEN PERFORMED
Source: CMS coverage guidance
HCPCS G0255high
CURRENT PERCEPTION THRESHOLD/SENSORY NERVE CONDUCTION TEST, (SNCT) PER LIMB, ANY NERVE
Source: CMS coverage guidance
CPT 95873high
ELECTRICAL STIMULATION FOR GUIDANCE IN CONJUNCTION WITH CHEMODENERVATION (LIST SEPARATELY IN ADDITION TO CODE FOR PRIMARY PROCEDURE)
Source: CMS coverage guidance
Coding guidelines
Common synonyms
Complex regional pain syndrome I of unspecified lower limbComplex regional pain syndrome I of lower limb
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.