G90.52 is the authoritative medical code for Complex regional pain syndrome I of lower limb. This classification is used in medical billing and clinical recording to specify the clinical criteria for complex regional pain syndrome i of lower limb (ICD-10-CM G90.52), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Official Registry Overview & Definition
Complex regional pain syndrome I of lower limb is a non-billable ICD-10-CM category code G90.52. A more specific billable subcode must be selected for claims submission. Excludes1 (not coded here): causalgia of lower limb G57.7-; causalgia of upper limb G56.4-; complex regional pain syndrome II of lower limb G57.7-; complex regional pain syndrome II of upper limb G56.4-; dysfunction of the autonomic nervous system due to alcohol G31.2.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for G90.52 in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- causalgia of lower limb G57.7-
- causalgia of upper limb G56.4-
- complex regional pain syndrome II of lower limb G57.7-
- complex regional pain syndrome II of upper limb G56.4-
- dysfunction of the autonomic nervous system due to alcohol G31.2
Frequently Asked Questions (FAQ) & Clinical Guidance
Can G90.52 be billed directly?
No. G90.52 (Complex regional pain syndrome I of lower limb) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
What can't be coded together with G90.52?
Per official ICD-10-CM Excludes1 instructions, G90.52 must not be reported together with: causalgia of lower limb (G57.7-); causalgia of upper limb (G56.4-); complex regional pain syndrome II of lower limb (G57.7-); complex regional pain syndrome II of upper limb (G56.4-).
Nearest Codes in This Family
Official ICD-10-CM classifications closest to G90.52 in its code family, with their registry titles.
- G90 — Disorders of autonomic nervous system
- G90.0 — Idiopathic peripheral autonomic neuropathy
- G90.01 — Carotid sinus syncope
- G90.09 — Other idiopathic peripheral autonomic neuropathy
- G90.1 — Familial dysautonomia [Riley-Day]
- G90.2 — Horner's syndrome
- G90.3 — Multi-system degeneration of the autonomic nervous system
- G90.4 — Autonomic dysreflexia
- G90.5 — Complex regional pain syndrome I (CRPS I)
- G90.50 — Complex regional pain syndrome I, unspecified
View all 26 codes in the G90 family