David S. Maas, MD
Student in an Organized Health Care Education/Training Program · Pasadena, CA
David S. Maas, MD is a student in an organized health care education/training program with a practice address in Pasadena, California, and NPI 1538653688, issued on Jun 20, 2018. Check the license with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- David S. Maas
- Credential
- MD
- Primary taxonomy
- Student in an Organized Health Care Education/Training Program 390200000X
- Practice location
- 100 W California Blvd, Pasadena, CA 91105
- Phone
- (626) 421-7733
- Enumerated
- Jun 20, 2018
- Record last updated
- Jun 20, 2018 (not updated in 8 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20221104002680); accepts Medicare assignment
- Medical or professional school
- Creighton University School Of Medicine, 2018
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest student in an organized health care education/training program records → All 40,652 in California → Look up another NPI →
Also registered at 100 W California Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Devan Abhari, MDStudent in an Organized Health Care Education/Training Program1922849041
- Lina Acopians, DOHospitalist Physician1548821523
- Daniel Adran, MDNeuroradiology Physician1518456441
- Alipasha Adrangui, M.D.Hospitalist Physician1780911263
- Vahe Aghajanyan, M.D.Student in an Organized Health Care Education/Training Program1447047238
- Ignacio Aguilar, RNFARegistered Nurse First Assistant1497583603
Verify David S. Maas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.9 times the Medicare Part D claims of the average student in an organized health care education/training program in 2024
528 Medicare Part D claims for 64 beneficiaries, against an average of 185 among the 59,748 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 187 claims were for opioids.
Most prescribed
- Gabapentin77 claims
- Oxycodone Hcl54 claims
- Hydrocodone-Acetaminophen50 claims
- Methadone Hcl48 claims
- Lidocaine25 claims
- Diclofenac Sodium20 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 80.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- County OF Santa ClaraSan Jose, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
David S. Maas among 40,652 student in an organized health care education/training program records in California
David S. Maas, MD is one of 40,652 student in an organized health care education/training program records with a practice address in California. 16% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 17% of them.
- NPI issued2018 · 17% of these records are older, 80% newer
- In a Medicare fileYes · 16% of these records are
- In the CMS Doctors and Clinicians fileYes · 6% of these records are
- Graduated2018 · median 2017 among the 2,409 with a school on file
- Record last updated2018 · 26% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 390200000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
735 student in an organized health care education/training program records list a practice address in Pasadena
They are 735 of the 10,525 NPPES records with a practice address in Pasadena, and 40,652 student in an organized health care education/training program records in California.
All 40,652 in California → Every provider in Pasadena → Student in an Organized Health Care Education/Training Program nationwide →
The 8 student in an organized health care education/training program records with the nearest ZIP codes
- David BesslerPasadena, CA 911051316196645
- Leslie Del RioPasadena, CA 911051851527113
- Susanne Earl, MDPasadena, CA 911051821233537
- Carol Garcia-BenitezPasadena, CA 911051750530085
- Leticia GomezPasadena, CA 911051306960570
- Norma HernandezPasadena, CA 911051619250149
- Chi Lee, MDPasadena, CA 911051083875207
- Gina LlevaPasadena, CA 911051407045537
Common questions
What is David S. Maas, MD's NPI number?
David S. Maas, MD's National Provider Identifier (NPI) is 1538653688, issued on Jun 20, 2018. An NPI identifies a provider in billing; it is not a license.
Where is David S. Maas, MD located?
The NPPES record lists a practice address at 100 W California Blvd, Pasadena, CA, 91105. Phone: (626) 421-7733. Providers update this record themselves, so call before visiting.
How can I verify David S. Maas, MD's license?
Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does David S. Maas, MD prescribe under Medicare Part D?
In 2024, David S. Maas, MD had 528 Medicare Part D claims for 64 beneficiaries; the average among student in an organized health care education/training program prescribers was 185. Part D covers Medicare prescriptions only.
What is David S. Maas, MD's MIPS final score?
The 2023 MIPS final score is 80.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.