G44.1 — Vascular headache, not elsewhere classified
G44.1 is a billable, specific ICD-10-CM code for vascular headache, not elsewhere classified. It is valid for submission on a claim.
Excludes2 — not included here, but may coexist
The excluded condition is not part of this code, but a patient can have both. You may code both.
Excludes1 inherited from the categories above G44.1
These are not written on G44.1, but they bind it: a note on a category applies to every code beneath it. Billing G44.1 with anything listed here is a denial.
Excludes2 inherited from the categories above G44.1
Also inherited, and the opposite of Excludes1: these conditions are not part of G44.1, but a patient can have both, so you may code both.
Risk adjustment
G44.1 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
G44.1 is named in 11 Medicare coverage policies — 11 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A53057Billing and Coding: Home Health Occupational Therapy
- A56273Billing and Coding: Chiropractic Services
- A56551Billing and Coding: Visual Fields Testing
- A56612Billing and Coding: CT of the Head
How G44.1 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to G44.1.
- Headache›vascular NEC
Code history
G44.1 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share G44. If G44.1 is not quite right, the correct code is usually one of these.
Questions about G44.1
- Is G44.1 a billable ICD-10-CM code?
- Yes. G44.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does G44.1 sit in the tabular list?
- Diseases of the nervous system (G00-G99), in the block Episodic and paroxysmal disorders (G40-G47).
- What cannot be coded together with G44.1?
- G44.1 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above G44.1 (G44) and apply to it just the same.