Quick answers
- Does Grant K. Gillen accept Medicare assignment?
- Yes. Medicare's clinician data says Grant K. Gillen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Grant K. Gillen see?
- In 2024, CMS data shows 43 Original Medicare patients and 50 services for Grant K. Gillen. This counts Original Medicare only and measures volume, not quality.
- What is Grant K. Gillen's NPI number?
- 1346256096. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Grant K. Gillen, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 43 |
|---|---|
| Services billed to Medicare | 50 |
| Different services or procedures | 21 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Anesthesia for injection, drainage or aspiration procedures on spine or spinal cord of lower back accessed through skin using imaging guidance (01938)11 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- Arthritis75%
- High blood pressure67%
- Diabetes42%
- Anxiety40%
Practice locations
Addresses where Grant K. Gillen is enrolled with Medicare (CMS data updated October 2, 2026).
- 2701 Lake Villa DrMetairie, LA 70002 (504) 832‑2115
- 2701 Napoleon AveNew Orleans, LA 70115 (504) 267‑2805
- 3434 Houma Blvd, Suite 300Metairie, LA 70006 (504) 564‑7965
- 4633 Wichers DrMarrero, LA 70072 (504) 328‑0000
Group practices
Medicare enrollment lists Grant K. Gillen as a member of these groups (CMS data updated October 2, 2026).
- Zephyr Anesthesia LLC158 clinicians in the group
- Jefferson Anesthesia Consultants20 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in Metairie
Clinicians with the same Medicare primary specialty in Metairie, LA — not a recommendation.
Other clinicians in Zephyr Anesthesia LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2002 (24 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1346256096 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians