Dennis John, MD
NPI 1952808396 · Internal Medicine Physician · Valhalla, NY
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Dennis John, MD is a Internal Medicine Physician provider in Valhalla, NY (NPI 1952808396).
Provider details
- NPI number
- 1952808396
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 315715 (NY)
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 tenure28% of score
8 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
312 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 192 | $102 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 44 | $146 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 | 38 | $64 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 23 | $123 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 15 | $191 |
Typical Medicare-allowed amounts for these services range $64–$191 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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 · 29 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 118 | 48 |
| Atorvastatin Calcium | 100 | 50 |
| Lisinopril | 53 | 19 |
| Losartan Potassium | 50 | 20 |
| Metformin Hcl | 40 | 20 |
| Escitalopram Oxalate | 40 | 15 |
| Apixaban |
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-04-11
- Last updated
- 2023-02-09
- Certified
- 2023-02-09
Frequently asked questions
- What is Dennis John's NPI number?
- Dennis John's National Provider Identifier (NPI) is 1952808396, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Dennis John's specialty?
- Dennis John is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Dennis John located?
- Dennis John's practice location on file with NPPES is 100 Woods Rd, Valhalla, NY 10595-1530.
- What is Dennis John's phone number?
- The practice phone number listed in the NPPES registry for Dennis John is (914) 493-7000.
- Does Dennis John accept Medicare?
- Dennis John is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Dennis John's NPI active?
- Yes — Dennis John's NPI (1952808396) is active in the NPPES registry as of the last update on 2023-02-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.