R51.9 – Headache, unspecified
ICD-10-CM 2027 diagnosis code · General symptoms and signs
ICD-10-CM code
R51.9
- Code
R51.9(claims format:R519)- Description
- Headache, unspecified
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 18. Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
- Block
- R50-R69 General symptoms and signs
- Parent codes
- R51
Notes for R51.9
Applicable to:
- Facial pain NOS
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
R51 – Headache
Index terms for R51.9
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in R51
Frequently asked questions
What is ICD-10 code R51.9?
R51.9 is the ICD-10-CM code for headache, unspecified, in the block R50-R69 (General symptoms and signs).
Is R51.9 a billable code?
Yes. R51.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does R51.9 belong to?
It belongs to category R51 – Headache.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.