ICD-10-CM Alphabetic Index · FY 2027 85 Entries
Headache in the ICD-10-CM Index ICD-10-CM
The main term Headache carries 85 index entries pointing to 42 ICD-10-CM codes. The default entry is R51.9, the code the bare main term maps to; every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.
✓ Built from the official CMS FY 2027 index fileEffective Oct 1, 2026 – Sep 30, 2027
85
Index Entries
42
Codes Referenced
R51.9
Default Code
H
Letter
85 of 85 shown
ICD-10-CM
Index Entries Under Headache 85 entries · 42 codes
Headache R51.9
with
orthostatic component NEC R51.0
positional component NEC R51.0
allergic NEC G44.89
associated with sexual activity G44.82
cervicogenic G44.86
chronic daily R51.9
cluster G44.009
chronic G44.029
intractable G44.021
not intractable G44.029
episodic G44.019
intractable G44.011
not intractable G44.019
intractable G44.001
not intractable G44.009
cough (primary) G44.83
daily chronic R51.9
drug-induced NEC G44.40
intractable G44.41
not intractable G44.40
exertional (primary) G44.84
histamine G44.009
intractable G44.001
not intractable G44.009
hypnic G44.81
lumbar puncture G97.1
medication overuse G44.40
intractable G44.41
not intractable G44.40
menstrual see Migraine, menstrual
migraine (type) G43.909 see also Migraine
nasal septum R51.9
neuralgiform, short lasting unilateral, with conjunctival injection and tearing (SUNCT) G44.059
intractable G44.051
not intractable G44.059
new daily persistent (NDPH) G44.52
orgasmic G44.82
periodic syndromes in adults and children G43.C0
with refractory migraine G43.C1
intractable G43.C1
not intractable G43.C0
without refractory migraine G43.C0
postspinal puncture G97.1
post-traumatic G44.309
acute G44.319
intractable G44.311
not intractable G44.319
chronic G44.329
intractable G44.321
not intractable G44.329
intractable G44.301
not intractable G44.309
pre-menstrual see Migraine, menstrual
preorgasmic G44.82
primary
cough G44.83
exertional G44.84
stabbing G44.85
thunderclap G44.53
rebound G44.40
intractable G44.41
not intractable G44.40
short lasting unilateral neuralgiform, with conjunctival injection and tearing (SUNCT) G44.059
intractable G44.051
not intractable G44.059
specified syndrome NEC G44.89
spinal and epidural anesthesia - induced T88.59 Non-billable
in labor and delivery O74.5
in pregnancy O29.4 Non-billable
postpartum, puerperal O89.4
spinal fluid loss (from puncture) G97.1
stabbing (primary) G44.85
tension (-type) G44.209
chronic G44.229
intractable G44.221
not intractable G44.229
episodic G44.219
intractable G44.211
not intractable G44.219
intractable G44.201
not intractable G44.209
thunderclap (primary) G44.53
vascular NEC G44.1
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Related Index Terms
Source: Centers for Medicare & Medicaid Services, FY 2027 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2026 through September 30, 2027.
