ICD-10-CM 2027
ICD-10 code for transient monoplegia
From the official ICD-10-CM alphabetic index entry “Monoplegia › transient”. Page updated September 29, 2026.
About coding transient monoplegia
The ICD-10-CM code for transient monoplegia is R29.818 (Other symptoms and signs involving the nervous system).
Within R29.81, choose R29.818 (Other symptoms and signs involving the nervous system) only when documentation doesn't support a more specific option: facial weakness (R29.810).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 091 (Other Disorders of Nervous System with MCC, relative weight 1.7046), DRG 092 (Other Disorders of Nervous System with CC, relative weight 1.0239) and DRG 093 (Other Disorders of Nervous System without CC/MCC, relative weight 0.7783), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about transient monoplegia ICD-10 codes
What is the ICD-10 code for transient monoplegia?
- R29.818 — Other symptoms and signs involving the nervous system.
Is R29.818 billable?
- Yes. R29.818 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R29.818 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R29.818 as a principal diagnosis.
Is R29.818 a CC or MCC?
- No. R29.818 is neither a CC nor an MCC under MS-DRG v44.0.