John Mackay, M.D.
NPI 1851380810 · Emergency Medicine Physician · El Paso, TX
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Mackay, M.D. is a Emergency Medicine Physician provider in El Paso, TX (NPI 1851380810).
Provider details
- NPI number
- 1851380810
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- J4898 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
121 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) |
|---|---|---|
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 53 | $116 |
| Emergency Department Visit With High Level of Medical Decision Making99285 | 42 | $167 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 26 | $8 |
Typical Medicare-allowed amounts for these services range $8–$167 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ondansetron Hcl | 26 | 26 |
| Ibuprofen | 25 | 24 |
| Tramadol Hcl | 15 | 15 |
| Cephalexin | 14 | 14 |
| Dexamethasone | 14 | 14 |
| Nitrofurantoin Monohyd/M-Crystbrand: Nitrofurantoin Mono-Macro | 12 | 12 |
| Cefuroxime Axetilbrand: Cefuroxime | 11 | 11 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-10-20
- Last updated
- 2023-11-08
- Certified
- 2023-11-08
Frequently asked questions
- What is John Mackay's NPI number?
- John Mackay's National Provider Identifier (NPI) is 1851380810, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Mackay's specialty?
- John Mackay is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Mackay located?
- John Mackay's practice location on file with NPPES is 4815 Alameda Ave, El Paso, TX 79905-2705.
- What is John Mackay's phone number?
- The practice phone number listed in the NPPES registry for John Mackay is (915) 521-7415.
- Does John Mackay accept Medicare?
- John Mackay is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Mackay's NPI active?
- Yes — John Mackay's NPI (1851380810) is active in the NPPES registry as of the last update on 2023-11-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.