Gregory Mackay, APRN
NPI 1497436596 · Acute Care Nurse Practitioner · Norwich, CT
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Mackay, APRN is a Acute Care Nurse Practitioner provider in Norwich, CT (NPI 1497436596).
Provider details
- NPI number
- 1497436596
- Entity type
- Individual
- Primary specialty
- Acute Care Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- APRN
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
3 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
61 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Critical Care, First 30-74 Minutes99291 | 41 | $184 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 20 | $68 |
Typical Medicare-allowed amounts for these services range $68–$184 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2023-07-31
- Last updated
- 2023-08-21
- Certified
- 2023-08-21
Frequently asked questions
- What is Gregory Mackay's NPI number?
- Gregory Mackay's National Provider Identifier (NPI) is 1497436596, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Mackay's specialty?
- Gregory Mackay is listed in the NPPES registry with a primary specialty of Acute Care Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Gregory Mackay located?
- Gregory Mackay's practice location on file with NPPES is 326 Washington St, Norwich, CT 06360-2740.
- What is Gregory Mackay's phone number?
- The practice phone number listed in the NPPES registry for Gregory Mackay is (860) 889-8331.
- Does Gregory Mackay accept Medicare?
- Gregory Mackay is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Mackay's NPI active?
- Yes — Gregory Mackay's NPI (1497436596) is active in the NPPES registry as of the last update on 2023-08-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.