Dr. Aras Nikodemas Mattis, MD, PhD
- Medicare services, 2021
- 72
- Publications
- 41
- MIPS score, 2024
- 85
- Hospital affiliations
- 1
- Industry payments
- $26,795
- Practice address
- 505 Parnassus Ave, Box 0296, San Francisco, CA 94143
- Practice phone
- Call (415) 353-2733
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Mattis' professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Aras Nikodemas Mattis is a pathologist in San Francisco, California
Dr. Mattis practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health.
Dr. Mattis' NPI, 1326374869, was assigned on October 18, 2009. Dr. Mattis graduated from University of Illinois College of Medicine - Chicago in 2007. Dr. Mattis holds California license A108366.
- NPI
- 1326374869NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9032351069
- NPI enumeration date
- October 18, 2009
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (415) 353-2733
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 45
- Medical school graduation
- 2007
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Aras Nikodemas Mattis practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California
Dr. Mattis' primary practice is UCSF Helen Diller Medical Center at Parnassus Heights, at 505 Parnassus Ave, Box 0296, San Francisco, CA 94143 in San Francisco County. The practice phone is (415) 353-2733.
- UCSF Helen Diller Medical Center at Parnassus Heights505 Parnassus Ave, Box 0296, San Francisco, CA 94143 · San Francisco CountyPhone(415) 353-2733
Source: Dmand AI Affiliation Data
Dr. Aras Nikodemas Mattis is affiliated with 1 site of care and 4 medical groups
Dr. Mattis' primary practice is UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health. The medical group on file is UCSF Pediatrics. Dmand AI also links Dr. Mattis to 3 more medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Aras Nikodemas Mattis' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mattis practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| UCSF Helen Diller Medical Center at Parnassus Heights | Available with a free account |
| +3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Aras Nikodemas Mattis is one of 297 pathologists in California
Anatomic pathology is Dr. Mattis' primary specialty in the NPI Registry, under taxonomy code 207ZP0101X. Dr. Mattis is board certified in pathology - anatomic by the American Board of Pathology. Dr. Mattis is licensed in California.
Specialties and state licenses
- Anatomic pathology, CaliforniaPrimary
Pathologists near Dr. Mattis
Counts of pathologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Aras Nikodemas Mattis billed Medicare for 72 services in 2021
CMS data shows 72 Medicare services from Dr. Mattis across 3 procedure codes in 2021. Medicare paid $3,634 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Mattis' Medicare services by type, 2020 to 2021
- 2020
- 2021
- Lab and pathology
- 2020: 2732021: 7274%
Dr. Mattis compared with the California median for pathologists, 2021
- Dr. Mattis
- California median
- Medicare services
- 72vs 67889% below
Medians across 211 pathologists in California with Dmand AI profiles that report each measure.
Dr. Mattis' most billed Medicare procedure codes, 2021
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Mattis and other pathologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Aras Nikodemas Mattis' patients have a median age of 36
Across all payers, Dmand AI patient panel data puts Dr. Mattis' median patient age at 36, with 99% women.
Dr. Mattis' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 36
Patient panel by sex, all payers
- Women99%
- Men0%
Source: Dmand AI Patient Panel Data
Dr. Aras Nikodemas Mattis scored 85 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 85 out of 100 for Dr. Mattis for performance year 2024, reported as part of a group. Dr. Mattis accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Mattis' MIPS scores, performance year 2024
- 85of 100Final score
- 81.1of 100Quality
- 40of 100Improvement Activities
- 71of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Aras Nikodemas Mattis has 41 publications on record
Dmand AI links 41 papers to Dr. Mattis, published from 2007 to 2025. 2020 was the busiest year, with 5. The most frequent topics are Hepatocytes, Liver and Aneuploidy. Dr. Mattis has published most often in Hepatology. Dr. Mattis' most frequent co-authors are Jacquelyn Jo Maher, MD, Kwun Wah Wen, MD and Jennifer Y. Chen, MD.
Dr. Mattis' papers by year, 2016 to 2025
Topics Dr. Mattis writes about most
- Hepatocytes
- Liver
- Aneuploidy
- Cell Differentiation
- Flow Cytometry
- Colorectal Neoplasms
- Induced Pluripotent Stem Cells
- Adenocarcinoma
Dr. Mattis' most frequent co-authors
- Jacquelyn Jo Maher, MD5 shared papers
- Kwun Wah Wen, MD4 shared papers
- Jennifer Y. Chen, MD2 shared papers
Recent publications by Dr. Mattis
Environ Health
Int J Mol Sci
See who Dr. Mattis researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Mattis works with, so you can find a warm path to the right pathologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Aras Nikodemas Mattis received $26,795 in industry payments from 2022 to 2025
CMS Open Payments shows 20 general payments to Dr. Mattis from 5 drug and device companies from 2022 to 2025. Speaker and faculty fees make up the largest share, 55% of the total. BioMarin Pharmaceutical Inc. paid the most, $21,922.
General payments to Dr. Mattis by program year, 2022 to 2025
General payments to Dr. Mattis by kind, 2022 to 2025
- Speaker and faculty fees$14,68755%
- Consulting fees$8,40131%
- Education$3,70614%
Companies that paid Dr. Mattis the most, 2022 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Aras Nikodemas Mattis graduated from University of Illinois College of Medicine - Chicago
Dr. Mattis graduated from University of Illinois College of Medicine - Chicago in 2007.
- Medical school
- Board certified in pathology - anatomic
Source: Dmand AI Professional Profile Data
Dr. Aras Nikodemas Mattis accepts plans from 2 insurance carriers
Dr. Mattis is in network with 2 carriers, including United Healthcare and Blue Cross and Blue Shield of Kansas City. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- United Healthcare
- Blue Cross and Blue Shield of Kansas City
Plan types Dr. Mattis accepts, by number of carriers
- EPO1
- HMO1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Aras Nikodemas Mattis's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Aras Nikodemas Mattis
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Aras Nikodemas Mattis' NPI number?
Dr. Aras Nikodemas Mattis' NPI number is 1326374869. It was assigned on October 18, 2009, and it is active in the NPI Registry.
What kind of doctor is Dr. Aras Nikodemas Mattis?
Dr. Aras Nikodemas Mattis is a pathologist in San Francisco, California. The primary specialty in the NPI Registry is Anatomic Pathology Physician (taxonomy code 207ZP0101X).
Where does Dr. Aras Nikodemas Mattis practice?
Dr. Mattis practices at 505 Parnassus Ave, Box 0296, San Francisco, CA 94143. Dr. Mattis' primary practice is UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health. Dmand AI also links Dr. Mattis to 3 medical groups.
What is Dr. Aras Nikodemas Mattis' office phone number?
The practice phone on file for Dr. Mattis is (415) 353-2733.
What is Dr. Aras Nikodemas Mattis' medical license number?
Dr. Mattis holds California license A108366.
Which hospitals is Dr. Aras Nikodemas Mattis affiliated with?
Dr. Mattis practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California.
What medical group is Dr. Aras Nikodemas Mattis part of?
Dr. Mattis is linked to UCSF Pediatrics. Dmand AI links Dr. Mattis to 3 more medical groups.
Does Dr. Aras Nikodemas Mattis accept Medicare?
Yes. CMS data shows Dr. Mattis billed Medicare for 72 services in 2021, and Dr. Mattis accepts Medicare assignment.
What is Dr. Aras Nikodemas Mattis' MIPS score?
Dr. Mattis' MIPS final score for performance year 2024 is 85 out of 100, reported as part of a group.
Is Dr. Aras Nikodemas Mattis board certified?
Yes. Dr. Mattis is board certified in pathology - anatomic by the American Board of Pathology.
Show 7 more questionsShow fewer questions
What services does Dr. Aras Nikodemas Mattis bill to Medicare?
In 2021, Dr. Mattis' most billed Medicare services were lab and pathology test (88341), lab and pathology test (88342) and lab and pathology test (88309).
Where did Dr. Aras Nikodemas Mattis go to medical school?
Dr. Mattis graduated from University of Illinois College of Medicine - Chicago in 2007.
Has Dr. Aras Nikodemas Mattis received payments from drug or device companies?
CMS Open Payments shows $26,795 in general payments to Dr. Mattis from 5 companies from 2022 to 2025. The largest total came from BioMarin Pharmaceutical Inc.
How long has Dr. Aras Nikodemas Mattis been practicing?
Dr. Mattis graduated from medical school in 2007, 19 years ago.
Does Dr. Aras Nikodemas Mattis do research?
Dmand AI links 41 publications to Dr. Mattis, published from 2007 to 2025.
Who does Dr. Aras Nikodemas Mattis publish with?
Dr. Mattis' most frequent co-authors are Jacquelyn Jo Maher, MD (5 shared papers), Kwun Wah Wen, MD (4 shared papers) and Jennifer Y. Chen, MD (2 shared papers).
What insurance does Dr. Aras Nikodemas Mattis accept?
Dr. Mattis is in network with 2 carriers, including United Healthcare and Blue Cross and Blue Shield of Kansas City. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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