Ewan Johnson, MD, PHD
NPI 1043521313 · Internal Medicine Physician · Tomball, TX
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ewan Johnson, MD, PHD is a Internal Medicine Physician provider in Tomball, TX (NPI 1043521313).
Provider details
- NPI number
- 1043521313
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, PHD
- Sex
- Male
- Sole proprietor
- No
- License
- N8018 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
15 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
218 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 High Level of Medical Decision Making99285 | 91 | $168 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 88 | $116 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 28 | $8 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 11 | $68 |
Typical Medicare-allowed amounts for these services range $8–$168 (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 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 25 | 25 |
| Cefdinir | 22 | 22 |
| Meloxicam | 21 | 21 |
| Dexamethasone | 16 | 13 |
| Nitrofurantoin Monohyd/M-Crystbrand: Nitrofurantoin Mono-Macro | 16 | — |
| Tramadol Hcl | 15 | 15 |
| Metronidazole | 11 | 11 |
These counts cover prescriptions paid through Medicare Part D in 2024 — they include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 9359 Hwy 37 Suite DCorpus Christi, TX 78409-7840Phone: (800) 951-0182Fax: (832) 565-1921
Registry dates
- Enumerated
- 2010-07-01
- Last updated
- 2021-06-11
- Certified
- 2021-05-30
Frequently asked questions
- What is Ewan Johnson's NPI number?
- Ewan Johnson's National Provider Identifier (NPI) is 1043521313, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ewan Johnson's specialty?
- Ewan Johnson is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Ewan Johnson located?
- Ewan Johnson's practice location on file with NPPES is 13414 Medical Complex Dr Ste 6, Tomball, TX 77375-3333.
- What is Ewan Johnson's phone number?
- The practice phone number listed in the NPPES registry for Ewan Johnson is (281) 415-6687.
- Does Ewan Johnson accept Medicare?
- Ewan Johnson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ewan Johnson's NPI active?
- Yes — Ewan Johnson's NPI (1043521313) is active in the NPPES registry as of the last update on 2021-06-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.