DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

R51 Headache

  • Header · not billable

R51 is not billable. The category heads 2 billable codes in FY2027: the 2 codes directly below it.

ICD-10 code by name

What is the ICD-10 code for headache, unspecified?
Headache ICD-10 code: R51.9 Headache, unspecified. Alphabetic Index: Headache → R51.9. Search ICD-10 for headache

Where it sits

  1. Chapter 18 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
  2. R50-R69 General symptoms and signs (R50-R69)
  3. R51 Headache
Billable codes
2
Subdivisions
2
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
2

Codes in R51

  1. R51.0
    Headache with orthostatic component, not elsewhere classified
    Billable
    Inclusion terms 1

    Inclusion terms

    • Headache with positional component, not elsewhere classified
  2. R51.9
    Headache, unspecified 1 billable code
    Billable

Sources of each column.

Instructions

At R51

Excludes2

  • atypical face pain (G50.1) G50.1
  • migraine and other headache syndromes (G43-G44) G43 G44
  • trigeminal neuralgia (G50.0) G50.0

Notes that also apply

Chapter 18 instructions (Notes 9, Excludes2 4): printed on the chapter 18 page.

Index entries

  • Headachewithorthostatic component NEC → R51.0
  • Headachewithpositional component NEC → R51.0

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy