David Maas, MD
NPI 1538653688 · Student in an Organized Health Care Education/Training Program · Pasadena, CA
Enrolled with Medicare as Practitioner - Hospice/Palliative Care · source: CMS PECOS Public Provider Enrollment (2026.04.01)
David Maas, MD is a Student in an Organized Health Care Education/Training Program provider in Pasadena, CA (NPI 1538653688).
Provider details
- NPI number
- 1538653688
- Entity type
- Individual
- Primary specialty
- Student in an Organized Health Care Education/Training ProgramStudent, Health Care
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 0000
Specialties & taxonomies
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
179 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 | 58 | $74 |
| Initial Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99221 | 36 | $91 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 28 | $40 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 24 | $204 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 18 | $110 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Gabapentin | 77 | 20 |
| Oxycodone Hcl | 54 | 17 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 50 | 17 |
| Methadone Hcl | 48 | 13 |
| Lidocaine | 25 | — |
| Diclofenac Sodium | 20 | — |
| Morphine Sulfatebrand: Morphine Sulfate Er |
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-06-20
- Last updated
- 2018-06-20
Frequently asked questions
- What is David Maas's NPI number?
- David Maas's National Provider Identifier (NPI) is 1538653688, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is David Maas's specialty?
- David Maas is listed in the NPPES registry with a primary specialty of Student in an Organized Health Care Education/Training Program (Student, Health Care).
- Where is David Maas located?
- David Maas's practice location on file with NPPES is 100 W California Blvd, Pasadena, CA 91105-3010.
- What is David Maas's phone number?
- The practice phone number listed in the NPPES registry for David Maas is (626) 421-7733.
- Does David Maas accept Medicare?
- David Maas is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is David Maas's NPI active?
- Yes — David Maas's NPI (1538653688) is active in the NPPES registry as of the last update on 2018-06-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.