G44.1 — Vascular headache, not elsewhere classified
Is G44.1 billable?
Yes, but G44.1 is an unspecified code. G44.1 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, G44.1 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting G44.1 — the more specific alternatives are listed below.
G44.1 at a glance
| Code | G44.1 |
|---|---|
| Description | Vascular headache, not elsewhere classified |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does G44.1 group to?
G44.1 sits in MDC 01 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 102Headaches with MCCmedical
- 103Headaches without MCCmedical
How is G44.1 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to G44.1. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Headache › vascular NEC
Excludes2 — not included here
The conditions below are not part of G44.1, but a patient may have both at the same time. When documentation supports it, G44.1 and the excluded code may both be reported.
Excludes1 — never code together — inherited from G44
The conditions below can never be reported together with G44.1 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- headache NOS (R51.9)
Excludes2 — not included here — inherited from Chapter 6
The conditions below are not part of G44.1, but a patient may have both at the same time. When documentation supports it, G44.1 and the excluded code may both be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Excludes2 — not included here — inherited from G44
The conditions below are not part of G44.1, but a patient may have both at the same time. When documentation supports it, G44.1 and the excluded code may both be reported.
How long has G44.1 existed?
G44.1 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which conditions are coded to G44.1?
What other codes are in the G44 family? (6)
- G44.0Cluster headaches and other trigeminal autonomic cephalgias (TAC)not billable
- G44.2Tension-type headachenot billable
- G44.3Post-traumatic headachenot billable
- G44.4Drug-induced headache, not elsewhere classifiednot billable
- G44.5Complicated headache syndromesnot billable
- G44.8Other specified headache syndromesnot billable