John Hartweger, MD
NPI 1366443756 · Internal Medicine Physician · Saint Peters, MO
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Hartweger, MD is a Internal Medicine Physician provider in Saint Peters, MO (NPI 1366443756).
Provider details
- NPI number
- 1366443756
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 2001032147 (MO)
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
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
1,194 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 702 | $75 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 248 | $109 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 95 | $47 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 54 | $166 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 45 | $114 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 21 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levofloxacin | 54 | 51 |
| Prednisone | 52 | 46 |
| Amlodipine Besylate | 45 | 38 |
| Furosemide | 44 | 37 |
| Cephalexin | 31 | 31 |
| Metoprolol Tartrate | 29 | 24 |
| Atorvastatin Calcium | 28 | 22 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-08-09
- Last updated
- 2014-05-08
Frequently asked questions
- What is John Hartweger's NPI number?
- John Hartweger's National Provider Identifier (NPI) is 1366443756, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Hartweger's specialty?
- John Hartweger is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Hartweger located?
- John Hartweger's practice location on file with NPPES is 10 Hospital Dr, Saint Peters, MO 63376-1659.
- What is John Hartweger's phone number?
- The practice phone number listed in the NPPES registry for John Hartweger is (314) 317-0600.
- Does John Hartweger accept Medicare?
- John Hartweger is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Hartweger's NPI active?
- Yes — John Hartweger's NPI (1366443756) is active in the NPPES registry as of the last update on 2014-05-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.