NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1447389101 M.D.
Verify on CMS → Guillermo Cantu-Reyna, M.D.
Family Medicine Physician in National City, 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 147,760 in Family Medicine 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
2K
Medicare Part D claims · 176 beneficiaries · Family Medicine Physician avg: 3K
Generic prescribing
84%
generic claims · 14% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$18.67
1 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Guillermo Cantu-Reyna, M.D. filed 1,879 Medicare Part D claims in 2023 as a Family Medicine Physician in National City, California, prescribing 84% generic.
- 2K
- Part D claims, 2023
- 84%
- generic prescribing
- $18.67
- industry payments (Sunshine Act)
- ≥83rd
- pct by Part D claim volume (lower-bound band)
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.
CMS NPPES provider registry desk
NPI 1447389101 · Family Medicine Physician
NPI-10 · ENUM-MID · TAX-MEGA · RX-MID · BOOK-MID · PHOTO-ENUM
- NPI-10 1447389101
- ENUM-MID 2007
- TAX-MEGA 148K Family Medicine
- RX-MID 1,879
- BOOK-MID 15,933 in California
- PHOTO-ENUM Karima Causey-McKinley · 2007
Guillermo Cantu-Reyna, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,879 ≥ 83rd percentile 83% of 1,370,886 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
Guillermo Cantu-Reyna, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Guillermo Cantu-Reyna, M.D.?
Quality data not reportedPrimary specialty
Family Medicine Physician
Medicare Part D claims
1,879 45% vs specialty avg
Specialty distribution in California
How Family Medicine 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 Family Medicine 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).
Practice Address
Provider Details
| NPI | 1447389101 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 03/05/2007 |
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Guillermo Cantu-Reyna, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$19
Largest payer
ViiV Healthcare Company
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
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 Guillermo Cantu-Reyna, M.D.. To verify Guillermo Cantu-Reyna, M.D.'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
Guillermo Cantu-Reyna, M.D. - brand share 14.0%
Family Medicine Physician average
14% brand-name claims vs 84% generic, on 1,879 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.
1,879
Total Claims
$256K
Total Drug Cost
176
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 4,520
- Total Day Supply
- 133,875
- Brand vs Generic
- 14% brand / 84% generic
- Brand Drug Cost
- $214K
- Generic Drug Cost
- $41K
- Antibiotic Claims
- 11
Patient Demographics
- Average Patient Age
- 70.7 years
- Avg HCC Risk Score
- 1.26
- Gender Split
- 57% female / 43% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Guillermo Cantu-Reyna, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
175 claims
- Metformin Hcl
Metformin Hcl
142 claims
- Lisinopril
Lisinopril
112 claims
- Amlodipine Besylate
Amlodipine Besylate
95 claims
- Hydrochlorothiazide
Hydrochlorothiazide
73 claims
- Levothyroxine Sodium 68
Levothyroxine Sodium
68 claims
- Losartan Potassium 68
Losartan Potassium
68 claims
- Fluticasone Propio… 67
Fluticasone Propionate
67 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 175 |
| Metformin Hcl | 142 |
| Lisinopril | 112 |
| Amlodipine Besylate | 95 |
| Hydrochlorothiazide | 73 |
| Levothyroxine Sodium | 68 |
| Losartan Potassium | 68 |
| Fluticasone Propionate | 67 |
| Omeprazole | 63 |
| Diclofenac Sodium | 54 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Family Medicine Physician Overview
How Guillermo Cantu-Reyna, M.D. fits within the Family Medicine Physician landscape nationally.
147,760
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,418
Avg Claims per Provider
Guillermo Cantu-Reyna, M.D.'s 1,879 claims are below the specialty average of 3,418.
Nationwide Family Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Cantu-Reyna, both outside California so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2007)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Family Medicine Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Cantu-Reyna.
One of 15,933 Family Medicine Physician providers enrolled in California, 5 are shown here.
Dr. Omer Aba-Omer
MD
Santa Monica, CA
Dr. Michelle Ababa
MD
Wilmington, CA
Dr. Anna Tzeitel Abalos
MD
Roseville, CA
Dr. Adan Abarca
MD
Anaheim, CA
Dr. Lorraine Abate
M.D.
Sacramento, CA
Compare Family Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Guillermo Cantu-Reyna, M.D.'s specialty? ▼
Guillermo Cantu-Reyna, M.D. specializes in Family Medicine Physician and practices in National City, California. Credentials: M.D..
How much does Guillermo Cantu-Reyna, M.D. prescribe under Medicare Part D? ▼
In 2023, Guillermo Cantu-Reyna, M.D. wrote 1,879 Medicare Part D claims totaling $256K in drug costs for 176 beneficiaries.
Where is Guillermo Cantu-Reyna, M.D. located? ▼
Guillermo Cantu-Reyna, M.D. is located at 217 HIGHLAND AVE, National City, CA, 91950. Phone: (619) 434-7308.
What is Guillermo Cantu-Reyna, M.D.'s NPI number? ▼
Guillermo Cantu-Reyna, M.D.'s National Provider Identifier (NPI) is 1447389101, issued on 03/05/2007.
Does Guillermo Cantu-Reyna, M.D. prescribe more brand-name or generic drugs? ▼
Guillermo Cantu-Reyna, M.D.'s prescribing is 14% brand-name and 84% generic drugs by claim count, with $214K in brand drug costs.
How many Family Medicine Physician providers are there in the US? ▼
There are 147,760 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,418 Medicare Part D claims per year.
What drugs does Guillermo Cantu-Reyna, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Guillermo Cantu-Reyna, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Metformin Hcl, Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Guillermo Cantu-Reyna, M.D. accept Medicare? ▼
Guillermo Cantu-Reyna, M.D. appears in CMS Medicare data with 1,879 Part D claims and 176 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Guillermo Cantu-Reyna, M.D.'s credentials? ▼
Guillermo Cantu-Reyna, M.D.'s NPI is 1447389101 with credentials M.D.. 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
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.