John Armstrong, DO
NPI 1427679232 · Internal Medicine Physician · Rolla, MO
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Provider details
- NPI number
- 1427679232
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- 2023028809 (MO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
6 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
662 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 411 | $91 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 105 | $134 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 64 | $117 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 37 | $125 |
| Transitional Care Management Services for Problem of at Least Moderate Complexity99495 | 34 | $130 |
| Smoking and Tobacco Use Intensive Counseling, 4-10 Minutes99406 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 90 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 167 | 51 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 146 | 72 |
| Pantoprazole Sodium | 132 | 46 |
| Levothyroxine Sodium | 127 | 44 |
| Losartan Potassium | 124 | 28 |
| Gabapentin | 84 | 36 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$635 across 27 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (3)
- 817 Oak Knoll RdRolla, MO 65401-4715Phone: (573) 466-0228
- 1000 W 10th StRolla, MO 65401-2905Phone: (573) 364-9000
- 1000 Gw LnWaynesville, MO 65583-2339Phone: (573) 774-2715Fax: (573) 202-2410
Registry dates
- Enumerated
- 2020-05-03
- Last updated
- 2024-02-27
- Certified
- 2024-02-27
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.