Lee Kenneth Maas, M.D.
Emergency Medicine Physician · Pomona, CA
Lee Kenneth Maas, M.D. is an emergency medicine physician with a practice address in Pomona, California, and NPI 1548470081, issued on May 23, 2007. Check the license (California A101495, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Lee Kenneth Maas
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A101495 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1798 N Garey Ave, Pomona, CA 91767
- Phone
- (909) 865-9500
- Enumerated
- May 23, 2007
- Record last updated
- Aug 18, 2013 (not updated in 13 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20090928000005); accepts Medicare assignment
- Medical or professional school
- Loma Linda University School Of Medicine, 2006
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 1798 N Garey Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Monique AbdallaRegistered Nurse1871398297
- Brent Abutin, PTAPhysical Therapy Assistant1144728023
- Anna Adongo, M.D.Anesthesiology Physician1497011902
- Fran Allas, OTR/LNeurorehabilitation Occupational Therapist1467081828
- Yvette Ambroze, FNPFamily Nurse Practitioner1336616879
- Arjun Bakshi, DOEmergency Medicine Physician1659968303
Verify Lee Kenneth Maas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A101495Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
26% more Medicare Part D claims than the average emergency medicine physician in 2024
285 Medicare Part D claims for 186 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims. 29 claims were for opioids.
Most prescribed
- Ondansetron Odt25 claims
- Methylprednisolone23 claims
- Albuterol Sulfate Hfa20 claims
- Cephalexin18 claims
- Ibuprofen16 claims
- Sulfamethoxazole-Trimethoprim14 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): 94.6 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
- Cep America - CaliforniaGlendora, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Lee Kenneth Maas among 7,751 emergency medicine physician records in California
Lee Kenneth Maas, M.D. is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 40% of them.
- NPI issued2007 · 40% of these records are older, 50% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2006 · median 2011 among the 4,560 with a school on file
- Record last updated2013 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Pomona → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Donald Barceloux, M.D.Pomona, CA 917671295746386
- Gregory Burke, M.DPomona, CA 917671407940117
- Wesley Curry, M.DPomona, CA 917671194774935
- Richard Dorosh, M.D.Pomona, CA 917671902928690
- John Lee, M.DPomona, CA 917671538178272
- Keith McCarty, M.D.Pomona, CA 917671538171426
- Kenneth Nakamoto, M.D.Pomona, CA 917671215949102
- Hanne Noergaard, D.OPomona, CA 917671760434898
Common questions
What is Lee Kenneth Maas, M.D.'s NPI number?
Lee Kenneth Maas, M.D.'s National Provider Identifier (NPI) is 1548470081, issued on May 23, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Lee Kenneth Maas, M.D. located?
The NPPES record lists a practice address at 1798 N Garey Ave, Pomona, CA, 91767. Phone: (909) 865-9500. Providers update this record themselves, so call before visiting.
How can I verify Lee Kenneth Maas, M.D.'s license?
NPPES lists California license number A101495, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Lee Kenneth Maas, M.D. prescribe under Medicare Part D?
In 2024, Lee Kenneth Maas, M.D. had 285 Medicare Part D claims for 186 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Lee Kenneth Maas, M.D.'s MIPS final score?
The 2023 MIPS final score is 94.6 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.