G90.521 – Complex regional pain syndrome I of right lower limb
ICD-10-CM 2027 diagnosis code · Other disorders of the nervous system
ICD-10-CM code
G90.521
- Code
G90.521(claims format:G90521)- Description
- Complex regional pain syndrome I of right lower limb
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 6. Diseases of the nervous system (G00-G99)
- Block
- G89-G99 Other disorders of the nervous system
- Parent codes
- G90 › G90.5 › G90.52
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
G90 – Disorders of autonomic nervous system
Excludes1 (not coded here):
- dysfunction of the autonomic nervous system due to alcohol (G31.2)
G90.5 – Complex regional pain syndrome I (CRPS I)
Applicable to:
- Reflex sympathetic dystrophy
Related codes in G90.52
Frequently asked questions
What is ICD-10 code G90.521?
G90.521 is the ICD-10-CM code for complex regional pain syndrome I of right lower limb, in the block G89-G99 (Other disorders of the nervous system).
Is G90.521 a billable code?
Yes. G90.521 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does G90.521 belong to?
It belongs to category G90 – Disorders of autonomic nervous system.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.