R51.9 Headache, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Facial pain NOS

Applies from R51 Headache

Excludes2 (not included here)

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

MS-DRG index

Defines the logic of DRG(s) 102-103 in MDC 01.

Code annotations containing back-references to R51.9

Back-references to R51.9

• Type 1 Excludes: G43 Migraine ("headache NOS (R51.9)")
• Type 1 Excludes: G44 Other headache syndromes ("headache NOS (R51.9)")
• Type 2 Excludes: G89 Pain, not elsewhere classified ("headache (R51.9)")
• Type 1 Excludes: R52 Pain, unspecified ("headache (R51.9)")

Diagnosis Index entries for R51.9

• Headache
• Headache › chronic daily
• Headache › daily chronic
• Headache › nasal septum
• Pain (s) › face, facial

Nearby codes

• R51 Headache
• R51.0 Headache with orthostatic component, not elsewhere classified
• R51.9 Headache, unspecified (this code)