NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1770771511 MD
Verify on CMS → Alexander Castellanos, MD
Family Medicine Physician in Templeton, 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 · 211 beneficiaries · Family Medicine Physician avg: 3K
MIPS score
30/100
▼ 54 pts below national avg 83.5 · Below average
What the federal data shows
Alexander Castellanos, MD reported a CMS MIPS final score of 30/100 - below the 83.5 national average - and filed 1,895 Medicare Part D claims in 2023.
- 30/100
- MIPS score · -53 vs avg
- 2K
- Part D claims, 2023
- Likely
- board-certified (heuristic)
- ≥3rd
- pct among measured MIPS (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 1770771511 · Family Medicine Physician
NPI-10 · ENUM-MID · TAX-MEGA · MIPS-LOW · RX-MID · BOOK-MID · PHOTO-FINISH
- NPI-10 1770771511
- ENUM-MID 2007
- TAX-MEGA 148K Family Medicine
- MIPS-LOW 30/100
- RX-MID 1,895
- BOOK-MID 15,933 in California
- PHOTO-FINISH Vicente Aldan · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Castellanos · th…
Castellanos · this provider
30 MIPS pts
- Marilyn Glaser ·…
Marilyn Glaser
30 MIPS pts
- Vicente Aldan · …
Vicente Aldan
30 MIPS pts
- Francisco Garabi…
Francisco Garabis
30 MIPS pts
- Abraham Garfinke…
Abraham Garfinkel
30 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Alexander Castellanos, MD's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
30 ≥ 3rd percentile 3% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured providers. 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 whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Alexander Castellanos, MD sits
This provider among family medicine physician peers
Across the 21,266 family medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, Alexander Castellanos, MD writes more Part D claims than 44% of them and scores higher on MIPS quality than 4% - placing this provider in the lower-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one family medicine physician peer from a representative sample of 60; the gold marker is Alexander Castellanos, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Alexander Castellanos, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 Alexander Castellanos, MD?
Below national averagePrimary specialty
Family Medicine Physician
Medicare Part D claims
1,895 45% vs specialty avg
MIPS final score
30/100 53.5 pts vs avg
Specialty distribution in California
How Family Medicine Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Alexander Castellanos, MD's 2023 MIPS final score plotted against the Family Medicine Physician national average
- MIPS Final Score
- 30/100
- vs 83.5 national avg · 2023 performance year
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 | 1770771511 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 10/05/2007 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
30
Final Score
Measured-score avg: 83.5
0
Quality
100
Cost
Reporting: Individual
Hospital and facility affiliations
Facilities where Alexander Castellanos, 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.
David B. Hammer
Templeton, 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 Alexander Castellanos, MD. To verify Alexander Castellanos, 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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
1,895
Total Claims
$106K
Total Drug Cost
211
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 4,810
- Total Day Supply
- 141,954
- Generic Drug Cost
- $35K
- Opioid Claims
- 25 (1.3% rate)
- Antibiotic Claims
- 70
Patient Demographics
- Average Patient Age
- 76.1 years
- Avg HCC Risk Score
- 1.04
- Gender Split
- 46% female / 54% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Alexander Castellanos, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Levothyroxine Sodium
Levothyroxine Sodium
320 claims
- Losartan Potassium
Losartan Potassium
185 claims
- Pravastatin Sodium
Pravastatin Sodium
142 claims
- Verapamil Er 111
Verapamil Er
111 claims
- Estradiol 90
Estradiol
90 claims
- Amlodipine Besylate 68
Amlodipine Besylate
68 claims
- Allopurinol 50
Allopurinol
50 claims
- Verapamil Sr 50
Verapamil Sr
50 claims
| Drug | Claims |
|---|---|
| Levothyroxine Sodium | 320 |
| Losartan Potassium | 185 |
| Pravastatin Sodium | 142 |
| Verapamil Er Verapamil Hcl | 111 |
| Estradiol | 90 |
| Amlodipine Besylate | 68 |
| Allopurinol | 50 |
| Verapamil Sr Verapamil Hcl | 50 |
| Atorvastatin Calcium | 42 |
| Metformin Hcl | 40 |
* 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 Alexander Castellanos, MD 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
Alexander Castellanos, MD's 1,895 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 Castellanos, both outside California so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (30 here).
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 Castellanos.
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 Alexander Castellanos, MD's specialty? ▼
Alexander Castellanos, MD specializes in Family Medicine Physician and practices in Templeton, California. Credentials: MD.
How much does Alexander Castellanos, MD prescribe under Medicare Part D? ▼
In 2023, Alexander Castellanos, MD wrote 1,895 Medicare Part D claims totaling $106K in drug costs for 211 beneficiaries.
What is Alexander Castellanos, MD's Medicare quality score? ▼
Alexander Castellanos, MD has a CMS MIPS Final Score of 30/100 (Quality: 0, Cost: 100). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Alexander Castellanos, MD located? ▼
Alexander Castellanos, MD is located at 699 S MAIN ST, Templeton, CA, 93465. Phone: (805) 434-1804.
What is Alexander Castellanos, MD's NPI number? ▼
Alexander Castellanos, MD's National Provider Identifier (NPI) is 1770771511, issued on 10/05/2007.
Does Alexander Castellanos, MD prescribe opioids? ▼
Yes, Alexander Castellanos, MD had 25 opioid claims in 2023 with an opioid prescribing rate of 1.3%.
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 Alexander Castellanos, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Alexander Castellanos, MD's most frequently prescribed drugs include Levothyroxine Sodium, Losartan Potassium, Pravastatin Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Alexander Castellanos, MD accept Medicare? ▼
Alexander Castellanos, MD appears in CMS Medicare data with 1,895 Part D claims and 211 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Alexander Castellanos, MD's credentials? ▼
Alexander Castellanos, MD's NPI is 1770771511 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.