ICD-10-CM 2027
ICD-10 code for reflex
From the official ICD-10-CM alphabetic index entry “Reflex”. Page updated September 29, 2026.
About coding reflex
The ICD-10-CM code for reflex is R29.2 (Abnormal reflex). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on R29.2.
Within R29 (other symptoms and signs involving the nervous and musculoskeletal systems), R29.2 is specifically for abnormal reflex. Related codes cover tetany (R29.0), Meningismus (R29.1), abnormal posture (R29.3), Clicking hip (R29.4), transient paralysis (R29.5), repeated falls (R29.6), National Institutes of Health Stroke Scale (NIHSS) score (R29.7), other symptoms and signs involving the nervous and musculoskeletal systems (R29.8) and 1 more.
The conditions in its Excludes2 note aren't part of R29.2, but may be coded alongside it if the patient has both: abnormal pupillary reflex (H57.0), hyperactive gag reflex (J39.2) and vasovagal reaction or syncope (R55).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific reflex codes (official index)
Common questions about reflex ICD-10 codes
What is the ICD-10 code for reflex?
- R29.2 — Abnormal reflex. More specific codes apply when the documentation supports them: J39.2, I73.9, R55.
What is the ICD-10 code for hyperactive gag reflex?
- J39.2 — Other diseases of pharynx.
What is the ICD-10 code for vasoconstriction reflex?
- I73.9 — Peripheral vascular disease, unspecified.
What is the ICD-10 code for vasovagal reflex?
- R55 — Syncope and collapse.
Is R29.2 billable?
- Yes. R29.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R29.2 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R29.2 as a principal diagnosis.
Is R29.2 a CC or MCC?
- No. R29.2 is neither a CC nor an MCC under MS-DRG v44.0.