---
title: "ICD-10-CM R51.9: Headache, unspecified | BillingBrief"
description: "ICD-10-CM code R51.9: Headache, unspecified. Category, related codes, and the official source, in plain English."
canonical: "https://billingbrief.com/icd10/r51.9/"
language: "en"
---

# R51.9 Headache, unspecified

ICD-10-CM · [CMS code reference](#source)

**Official ICD-10-CM description:** Headache, unspecified

## Related codes

-   [`R51.0` Headache with orthostatic component, not elsewhere classified ICD-10-CM](https://billingbrief.com/icd10/r51.0/)

## Common questions

### Is R51.9 a billable code?

Yes. R51.9 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.

## From the source

Official description from [CMS](https://www.cms.gov/medicare/coding-billing/icd-10-codes).
ICD-10-CM FY2027 (effective October 1, 2026).

Code set

ICD-10-CM

Category

R51 Headache

Chapter

Symptoms, signs and abnormal clinical and laboratory findings

Billable

Yes

Educational reference only. Not medical, legal, or billing advice. Always check the current official code set and payer policy before you bill. [About BillingBrief and our sources](https://billingbrief.com/about/).