FY2021
Effective from
- Code-level rules changed
- Inherited rules changed
Other specified headache syndromes
Category — select a more specific code
CDC/NCHS · FY2021headache NOS (R51.9)
headache with orthostatic or positional component, not elsewhere classified (R51.0)
For US diagnosis claims covered by HIPAA, ICD-10-CM is required from October 1, 2015.
Use the service date for outpatient/professional claims and the discharge date for hospital inpatient claims. Earlier encounters use ICD-9-CM; each individual code must also be valid for the applicable date.
Official coding guidelines → · CMS ↗First observed · 2015-10-01
Latest recorded change · FY2021
Effective from
Other specified headache syndromes
Category — select a more specific code
CDC/NCHS · FY2021| All editions | Effective from | Code history |
|---|---|---|
| FY2016 | 2015-10-01 | First observed |
| FY2017 | 2016-10-01 | No tabular change |
| FY2018 | 2017-10-01 | No tabular change |
| FY2019 | 2018-10-01 | No tabular change |
| FY2020 | 2019-10-01 | No tabular change |
| FY2020 · April | 2020-04-01 | No tabular change |
| FY2021 | 2020-10-01 | Code-level rules changed · Inherited rules changed |
| FY2021 · 01-01 | 2021-01-01 | No tabular change |
| FY2022 | 2021-10-01 | No tabular change |
| FY2022 · 04-01 | 2022-04-01 | No tabular change |
| FY2023 | 2022-10-01 | No tabular change |
| FY2023 · 04-01 | 2023-04-01 | No tabular change |
| FY2024 | 2023-10-01 | No tabular change |
| FY2024 · 04-01 | 2024-04-01 | No tabular change |
| FY2025 | 2024-10-01 | No tabular change |
| FY2025 · 04-01 | 2025-04-01 | No tabular change |
| FY2026 | 2025-10-01 | No tabular change |
| FY2026 · April | 2026-04-01 | No tabular change |
| FY2027 | 2026-10-01 | No tabular change |
headache with orthostatic or positional component, not elsewhere classified (R51.0)
headache NOS (R51.9)
G44.81Hypnic headacheBillable / specificG44.82Headache associated with sexual activityBillable / specificG44.83Primary cough headacheBillable / specificG44.84Primary exertional headacheBillable / specificG44.85Primary stabbing headacheBillable / specificG44.86Cervicogenic headacheBillable / specificG44.89Other headache syndromeBillable / specificOther entries in the same category; these are not automatic substitutes.
| Code | Description | Category · further specificity required |
|---|---|---|
| G44.0 | Cluster headaches and other trigeminal autonomic cephalgias (TAC) | Category · further specificity required |
| G44.1 | Vascular headache, not elsewhere classified | Billable / specific |
| G44.2 | Tension-type headache | Category · further specificity required |
| G44.3 | Post-traumatic headache | Category · further specificity required |
| G44.4 | Drug-induced headache, not elsewhere classified | Category · further specificity required |
| G44.5 | Complicated headache syndromes | Category · further specificity required |
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