NPI registry status
Active
2026 NPPES data Dermatology Physician NPI 1679645329 MD
Verify on CMS → Cynthia Mates, MD
Dermatology Physician in Martinez, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 14,645 in Dermatology Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
752
Medicare Part D claims · 259 beneficiaries · Dermatology Physician avg: 729
Generic prescribing
80%
generic claims · 20% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Cynthia Mates, MD filed 752 Medicare Part D claims in 2023 as a Dermatology Physician in Martinez, California, prescribing 80% generic.
- 752
- Part D claims, 2023
- 80%
- generic prescribing
- Likely
- board-certified (heuristic)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Cynthia Mates, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
752 Top 29% higher than 71% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Cynthia Mates, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Cynthia Mates, MD?
Quality data not reportedPrimary specialty
Dermatology Physician
Medicare Part D claims
752 3% vs specialty avg
Specialty distribution in California
How Dermatology Physician compares to other specialties among California providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Dermatology Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Cynthia Mates, MD appears in the CMS NPPES registry as a Dermatology Physician provider holding MD credentials at 200 MUIR RD, Martinez, CA, 94553, with a listed phone of (925) 372-1000. NPI 1679645329 was issued on 11/15/2006.
Medicare Part D records for calendar year 2023 show 752 prescription claims written by this provider, covering 259 Medicare beneficiaries and totaling roughly $243K in drug spend, split 20% brand-name and 80% generic by claim count.
Dermatology Physician is a mid-sized specialty nationwide, with 14,645 enrolled providers across 53 states and an average of 729 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1679645329 |
|---|---|
| Specialty | Dermatology Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 11/15/2006 |
Hospital and facility affiliations
Facilities where Cynthia Mates, MD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Permanente Medical Group Inc
Richmond, CA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Cynthia Mates, MD. To verify Cynthia Mates, MD's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Cynthia Mates, MD - brand share 20.0%
Dermatology Physician average
20% brand-name claims vs 80% generic, on 752 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
752
Total Claims
$243K
Total Drug Cost
259
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 835
- Total Day Supply
- 22,731
- Brand vs Generic
- 20% brand / 80% generic
- Brand Drug Cost
- $219K
- Generic Drug Cost
- $24K
- Antibiotic Claims
- 27
Patient Demographics
- Average Patient Age
- 74.8 years
- Avg HCC Risk Score
- 1.19
- Gender Split
- 61% female / 39% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Cynthia Mates, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Clobetasol Propion…
Clobetasol Propionate
76 claims
- Hydrocortisone
Hydrocortisone
75 claims
- Fluocinonide
Fluocinonide
71 claims
- Fluorouracil
Fluorouracil
68 claims
- Retin-A
Retin-A
50 claims
- Metronidazole
Metronidazole
42 claims
- Triamcinolone Acet…
Triamcinolone Acetonide
41 claims
- Vectical 24
Vectical
24 claims
| Drug | Claims |
|---|---|
| Clobetasol Propionate | 76 |
| Hydrocortisone | 75 |
| Fluocinonide | 71 |
| Fluorouracil | 68 |
| Retin-A Tretinoin | 50 |
| Metronidazole | 42 |
| Triamcinolone Acetonide | 41 |
| Vectical Calcitriol | 24 |
| Doxycycline Monohydrate | 23 |
| Calcipotriene | 20 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Dermatology Physician Overview
How Cynthia Mates, MD fits within the Dermatology Physician landscape nationally.
14,645
Dermatology Physician Providers in US
53
States with Dermatology Physician
729
Avg Claims per Provider
Cynthia Mates, MD's 752 claims are above the specialty average of 729.
Nearby Dermatology Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Mates.
Dr. Sumaira Aasi
MD
Stanford, CA
Dr. Christopher Abbott
M.D.
San Diego, CA
Dr. Eman Abdallah
D.O.
Los Angeles, CA
Dr. Farah Abdulla
MD
Duarte, CA
Dr. Sayyida Abdus-Salaam
M.D.
Daly City, CA
Compare Dermatology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Dermatology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Cynthia Mates, MD's specialty? ▼
Cynthia Mates, MD specializes in Dermatology Physician and practices in Martinez, California. Credentials: MD.
How much does Cynthia Mates, MD prescribe under Medicare Part D? ▼
In 2023, Cynthia Mates, MD wrote 752 Medicare Part D claims totaling $243K in drug costs for 259 beneficiaries.
Where is Cynthia Mates, MD located? ▼
Cynthia Mates, MD is located at 200 MUIR RD, Martinez, CA, 94553. Phone: (925) 372-1000.
What is Cynthia Mates, MD's NPI number? ▼
Cynthia Mates, MD's National Provider Identifier (NPI) is 1679645329, issued on 11/15/2006.
Does Cynthia Mates, MD prescribe more brand-name or generic drugs? ▼
Cynthia Mates, MD's prescribing is 20% brand-name and 80% generic drugs by claim count, with $219K in brand drug costs.
How many Dermatology Physician providers are there in the US? ▼
There are 14,645 Dermatology Physician providers across 53 states in the US. The average Dermatology Physician provider writes 729 Medicare Part D claims per year.
What drugs does Cynthia Mates, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Cynthia Mates, MD's most frequently prescribed drugs include Clobetasol Propionate, Hydrocortisone, Fluocinonide. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Cynthia Mates, MD accept Medicare? ▼
Cynthia Mates, MD appears in CMS Medicare data with 752 Part D claims and 259 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Cynthia Mates, MD's credentials? ▼
Cynthia Mates, MD's NPI is 1679645329 with credentials MD. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.