Aras Nikodemas Mattis, M.D., PH.D.
Anatomic Pathology Physician · San Francisco, CA
Aras Nikodemas Mattis, M.D., PH.D. is an anatomic pathology physician with a practice address in San Francisco, California, and NPI 1326374869, issued on Oct 18, 2009. Check the license (California A108366, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Aras Nikodemas Mattis
- Credential
- M.D., PH.D.
- Primary taxonomy
- Anatomic Pathology Physician 207ZP0101X
- License number
- A108366 CA
Self-reported in NPPES; status is on the state search - Practice location
- 505 Parnassus Ave, San Francisco, CA 94143
- Phone
- (415) 353-8987
- Enumerated
- Oct 18, 2009
- Record last updated
- Oct 18, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (415) 353-8987
- Medicare enrollment
- Enrolled (PECOS I20130805000180); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest anatomic pathology physician records → All 386 in California → Look up another NPI →
Also registered at 505 Parnassus Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Alexander Aabedi, MDStudent in an Organized Health Care Education/Training Program1245971480
- Kathryn Aaronson, RN, CPNPPediatric Nurse Practitioner1992030951
- Sharon AbadaStudent in an Organized Health Care Education/Training Program1003492844
- Abul Abbas, MBBSAnatomic Pathology Physician1881652964
- Jesse Abelson, MDInternal Medicine Physician1083843817
- Rhonald AbitonaAcute Care Nurse Practitioner1164993473
Verify Aras Nikodemas Mattis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A108366Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 74.5 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).
Industry payments in 2024: $6,496.36
4 payments; by number, the most common kind was consulting fee; the largest payer was BioMarin Pharmaceutical Inc. The 382 providers of this specialty with any payment received $3,145.53 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- University OF California San FranciscoSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Aras Nikodemas Mattis among 386 anatomic pathology physician records in California
Aras Nikodemas Mattis, M.D., PH.D. is one of 386 anatomic pathology physician records with a practice address in California. 56% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 61% of them.
- NPI issued2009 · 61% of these records are older, 35% newer
- In a Medicare fileYes · 56% of these records are
- In the CMS Doctors and Clinicians fileYes · 49% of these records are
- Graduated2007 · median 2000 among the 190 with a school on file
- Record last updated2009 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207ZP0101X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Anatomic Pathology Physician providers in California
There are 386 anatomic pathology physician records in California.
All 386 in California → Every provider in San Francisco → Anatomic Pathology Physician nationwide →
The 8 anatomic pathology physician records with the nearest ZIP codes
- Abul Abbas, MBBSSan Francisco, CA 941431881652964
- Soo-Jin Cho, M.D./PH.D.San Francisco, CA 941431104079524
- Won-Tak Choi, M.D., PH.D.San Francisco, CA 941431275860918
- James Grenert, MDSan Francisco, CA 941431174572390
- Andrew Horvai, MDSan Francisco, CA 941431891752309
- Grace Kim, MDSan Francisco, CA 941431447218599
- Steven Long, M.D.San Francisco, CA 941431194737908
- James McKerrow, MDSan Francisco, CA 941431922066067
Common questions
What is Aras Nikodemas Mattis, M.D., PH.D.'s NPI number?
Aras Nikodemas Mattis, M.D., PH.D.'s National Provider Identifier (NPI) is 1326374869, issued on Oct 18, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Aras Nikodemas Mattis, M.D., PH.D. located?
The NPPES record lists a practice address at 505 Parnassus Ave, San Francisco, CA, 94143. Phone: (415) 353-8987. Providers update this record themselves, so call before visiting.
How can I verify Aras Nikodemas Mattis, M.D., PH.D.'s license?
NPPES lists California license number A108366, 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.
What is Aras Nikodemas Mattis, M.D., PH.D.'s MIPS final score?
The 2023 MIPS final score is 74.5 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.