Michael Dittmar
NPI 1801357439 · Hospitalist Physician · Duarte, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Dittmar is a Hospitalist Physician provider in Duarte, CA (NPI 1801357439).
Provider details
- NPI number
- 1801357439
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- A178438 (CA)
Specialties & taxonomies
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
7 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
600 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 50 Minutes99233 | 521 | $126 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 79 | $123 |
Typical Medicare-allowed amounts for these services range $123–$126 (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
- 2019-03-27
- Last updated
- 2023-09-15
- Certified
- 2023-09-15
Frequently asked questions
- What is Michael Dittmar's NPI number?
- Michael Dittmar's National Provider Identifier (NPI) is 1801357439, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Dittmar's specialty?
- Michael Dittmar is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Dittmar located?
- Michael Dittmar's practice location on file with NPPES is 1500 Duarte Rd, Duarte, CA 91010-3012.
- What is Michael Dittmar's phone number?
- The practice phone number listed in the NPPES registry for Michael Dittmar is (626) 256-4673.
- Does Michael Dittmar accept Medicare?
- Michael Dittmar is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Dittmar's NPI active?
- Yes — Michael Dittmar's NPI (1801357439) is active in the NPPES registry as of the last update on 2023-09-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.