NPI registry status
Active
2026 NPPES data Emergency Medicine Physician NPI 1245610344 DO
Verify on CMS → Guy Bennallack, DO
Emergency Medicine Physician in Santa Maria, 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 64,463 in Emergency 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
475
Medicare Part D claims · 293 beneficiaries · Emergency Medicine Physician avg: 352
Generic prescribing
90%
generic claims · 6% 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
Guy Bennallack, DO filed 475 Medicare Part D claims in 2023 as a Emergency Medicine Physician in Santa Maria, California, prescribing 90% generic.
- 475
- Part D claims, 2023
- 90%
- 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.
Guy Bennallack, DO's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
475 Top 38% higher than 62% 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)
Guy Bennallack, DO practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 3 hospital affiliations - 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 Guy Bennallack, DO?
Quality data not reportedPrimary specialty
Emergency Medicine Physician
Medicare Part D claims
475 35% vs specialty avg
Specialty distribution in California
How Emergency 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 Emergency 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).
Guy Bennallack, DO appears in the CMS NPPES registry as an Emergency Medicine Physician provider holding DO credentials at 1400 E CHURCH ST BLDG 8, Santa Maria, CA, 93454, with a listed phone of (805) 739-3561. NPI 1245610344 was issued on 06/03/2015.
Medicare Part D records for calendar year 2023 show 475 prescription claims written by this provider, covering 293 Medicare beneficiaries and totaling roughly $12K in drug spend, split 6% brand-name and 90% generic by claim count.
Emergency Medicine Physician is a high-volume specialty nationwide, with 64,463 enrolled providers across 56 states and an average of 352 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 | 1245610344 |
|---|---|
| Specialty | Emergency Medicine Physician |
| Credentials | DO |
| Gender | Male |
| NPI Issued | 06/03/2015 |
Hospital and facility affiliations
Facilities where Guy Bennallack, DO 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.
According to CMS billing records, Guy Bennallack, DO is affiliated with 3 Medicare-billing facilities across 3 states.
Hawaii Emergency Physicians Associated Inc
Honokaa, HI
Pearsall Emergency Medicine Associates, PA
El Paso, TX
Santa Ynez River Physicians PC
Lompoc, 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 Guy Bennallack, DO. To verify Guy Bennallack, DO'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 · Generic-heavy
Guy Bennallack, DO - brand share 6.0%
Emergency Medicine Physician average
6% brand-name claims vs 90% generic, on 475 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.
475
Total Claims
$12K
Total Drug Cost
293
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 488
- Total Day Supply
- 4,192
- Brand vs Generic
- 6% brand / 90% generic
- Brand Drug Cost
- $3K
- Generic Drug Cost
- $9K
- Antibiotic Claims
- 134
Patient Demographics
- Average Patient Age
- 71.8 years
- Avg HCC Risk Score
- 1.75
- Gender Split
- 67% female / 33% male
- Age Distribution
- <65: 52, 65-74: 121, 75-84: 72, 85+: 48
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Guy Bennallack, DO prescribes most
Top Medicare Part D drugs by claim count, 2023
- Ondansetron Odt
Ondansetron Odt
75 claims
- Cefpodoxime Proxetil
Cefpodoxime Proxetil
50 claims
- Prednisone
Prednisone
36 claims
- Azithromycin 27
Azithromycin
27 claims
- Ibuprofen 23
Ibuprofen
23 claims
- Famotidine 21
Famotidine
21 claims
- Ketorolac Trometha… 20
Ketorolac Tromethamine
20 claims
- Cyclobenzaprine Hcl 19
Cyclobenzaprine Hcl
19 claims
| Drug | Claims |
|---|---|
| Ondansetron Odt Ondansetron | 75 |
| Cefpodoxime Proxetil | 50 |
| Prednisone | 36 |
| Azithromycin | 27 |
| Ibuprofen | 23 |
| Famotidine | 21 |
| Ketorolac Tromethamine | 20 |
| Cyclobenzaprine Hcl | 19 |
| Nitrofurantoin Mono-Macro Nitrofurantoin Monohyd/M-Cryst | 19 |
| Paxlovid (Eua) Nirmatrelvir/Ritonavir | 19 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Emergency Medicine Physician Overview
How Guy Bennallack, DO fits within the Emergency Medicine Physician landscape nationally.
64,463
Emergency Medicine Physician Providers in US
56
States with Emergency Medicine Physician
352
Avg Claims per Provider
Guy Bennallack, DO's 475 claims are above the specialty average of 352.
Nearby Emergency Medicine Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Bennallack.
Dr. Cooper Aakhus
MD
Stanford, CA
Dr. Pyra Aarden
MD
Martinez, CA
Dr. Neal Aaron
D.O.
Encinitas, CA
Eric Aaserude
Walnut Creek, CA
Dr. Nader Abas
MD
Barstow, CA
Compare Emergency Medicine 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 Emergency Medicine 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 Guy Bennallack, DO's specialty? ▼
Guy Bennallack, DO specializes in Emergency Medicine Physician and practices in Santa Maria, California. Credentials: DO.
How much does Guy Bennallack, DO prescribe under Medicare Part D? ▼
In 2023, Guy Bennallack, DO wrote 475 Medicare Part D claims totaling $12K in drug costs for 293 beneficiaries.
Where is Guy Bennallack, DO located? ▼
Guy Bennallack, DO is located at 1400 E CHURCH ST BLDG 8, Santa Maria, CA, 93454. Phone: (805) 739-3561.
What is Guy Bennallack, DO's NPI number? ▼
Guy Bennallack, DO's National Provider Identifier (NPI) is 1245610344, issued on 06/03/2015.
Does Guy Bennallack, DO prescribe more brand-name or generic drugs? ▼
Guy Bennallack, DO's prescribing is 6% brand-name and 90% generic drugs by claim count, with $3K in brand drug costs.
How many Emergency Medicine Physician providers are there in the US? ▼
There are 64,463 Emergency Medicine Physician providers across 56 states in the US. The average Emergency Medicine Physician provider writes 352 Medicare Part D claims per year.
What drugs does Guy Bennallack, DO prescribe most often? ▼
Based on 2023 Medicare Part D data, Guy Bennallack, DO's most frequently prescribed drugs include Ondansetron Odt, Cefpodoxime Proxetil, Prednisone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Guy Bennallack, DO accept Medicare? ▼
Guy Bennallack, DO appears in CMS Medicare data with 475 Part D claims and 293 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Guy Bennallack, DO's credentials? ▼
Guy Bennallack, DO's NPI is 1245610344 with credentials DO. 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.