Thomas Johnston, M.D.
NPI 1750550166 · Internal Medicine Physician · Louisville, KY
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Thomas Johnston, M.D. is a Internal Medicine Physician provider in Louisville, KY (NPI 1750550166).
Provider details
- NPI number
- 1750550166
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 42922 (KY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
18 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
244 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) |
|---|---|---|
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 244 | $129 |
Typical Medicare-allowed amounts for these services range $129–$129 (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
- 2008-02-29
- Last updated
- 2021-09-02
- Certified
- 2021-09-02
Frequently asked questions
- What is Thomas Johnston's NPI number?
- Thomas Johnston's National Provider Identifier (NPI) is 1750550166, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Thomas Johnston's specialty?
- Thomas Johnston is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Thomas Johnston located?
- Thomas Johnston's practice location on file with NPPES is 200 E Chestnut St, Louisville, KY 40202-1831.
- What is Thomas Johnston's phone number?
- The practice phone number listed in the NPPES registry for Thomas Johnston is (502) 629-5552.
- Does Thomas Johnston accept Medicare?
- Thomas Johnston is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Thomas Johnston's NPI active?
- Yes — Thomas Johnston's NPI (1750550166) is active in the NPPES registry as of the last update on 2021-09-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.