R51Header code — not billable
Headache
- Chapter
- 18. Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
- Category
- R51
- Effective date
- October 1, 2026
Related codes in category R51
Frequently asked questions
What is ICD-10 code R51?
R51 is an ICD-10-CM diagnosis code for Headache.
Is R51 a billable code?
No. R51 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is R51 in?
R51 falls under Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.
When did R51 become effective?
R51 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to R51?
R51 belongs to category R51, which includes 2 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.