ICD10BillableValid for clinical use
ICD-10 Code G90.50: Complex regional pain syndrome I, unspecified
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, unspecified 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)
currentG90.5
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 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
CPT 95921high
TESTING OF AUTONOMIC NERVOUS SYSTEM FUNCTION; CARDIOVAGAL INNERVATION (PARASYMPATHETIC FUNCTION), INCLUDING 2 OR MORE OF THE FOLLOWING: HEART RATE RESPONSE TO DEEP BREATHING WITH RECORDED R-R INTERVAL, VALSALVA RATIO, AND 30:15 RATIO
Source: CMS coverage guidance
CPT 95924high
TESTING OF AUTONOMIC NERVOUS SYSTEM FUNCTION; COMBINED PARASYMPATHETIC AND SYMPATHETIC ADRENERGIC FUNCTION TESTING WITH AT LEAST 5 MINUTES OF PASSIVE TILT
Source: CMS coverage guidance
CPT 95923high
TESTING OF AUTONOMIC NERVOUS SYSTEM FUNCTION; SUDOMOTOR, INCLUDING 1 OR MORE OF THE FOLLOWING: QUANTITATIVE SUDOMOTOR AXON REFLEX TEST (QSART), SILASTIC SWEAT IMPRINT, THERMOREGULATORY SWEAT TEST, AND CHANGES IN SYMPATHETIC SKIN POTENTIAL
Source: CMS coverage guidance
Coding guidelines
Common synonyms
Complex regional pain syndrome I, unspecifiedComplex regional pain syndrome I
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.