2026 NPPES data General Practice Physician NPI 1508082157 M.D.
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GILLIAN DORNER, M.D.

General Practice Physician in VENTURA, California. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
351
Medicare Part D claims · 22 beneficiaries · General Practice Physician avg: 3K
Generic prescribing
95%
generic claims · 5% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
87.188/100
▲ 4 pts above national avg 83.1 · [object Object]
What the federal data reveals: GILLIAN DORNER, M.D. is a General Practice Physician ([object Object]) practicing in VENTURA, California with a Medicare Part D prescribing footprint of 351 claims across 22 beneficiaries — 5% brand-name prescribing . Their CMS MIPS Final Score of 87.188/100 (national average: 83.1) reflects performance across Quality, Cost, Interoperability, and Improvement Activities .

What stands out: GILLIAN DORNER, M.D. reported a CMS MIPS final score of 87.188 out of 100, above the 83.1 national average, and filed 351 Medicare Part D claims in 2023. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board certification likely (heuristic — not verified)

GILLIAN DORNER, M.D. 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).

GILLIAN DORNER, M.D. at a glance

High performer (top quartile)

NPI registry status

Active

Issued 04/18/2007

NPI 1508082157

Primary specialty

General Practice Physician

Mid-sized

16,677 US NPIs in this specialty

Medicare Part D claims

351 88% vs specialty avg

2023 prescription claims

Specialty avg: 2,872

MIPS final score

87.188/100 4.088000000000008% pts

Above neutral band

vs 83.1 national avg

Specialty distribution in California

How General Practice Physician compares to other specialties among California providers

California providers

General Practice Physician share within California

1. General Practice Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
General Practice Physician share within California

Medicare quality performance — MIPS

GILLIAN DORNER, M.D.'s 2023 MIPS final score plotted against the General Practice Physician national average

High performer (top quartile)
MIPS Final Score
87.188/100
vs 83.1 national avg · 2023 performance year

MIPS final score (General Practice Physician) — 87.188/100 vs national avg 83.1

0%100%National avg83%87.2%
MIPS final score (General Practice Physician) — 87.188/100 vs national avg 83.1

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).

GILLIAN DORNER, M.D. is a General Practice Physician provider practicing in VENTURA, California, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: M.D.. NPI: 1508082157. This profile includes practice location, specialty classification, and organizational affiliations from the CMS provider registry. Provider information is self-reported to CMS and updated monthly.

GILLIAN DORNER, M.D. appears in the CMS NPPES registry as a General Practice Physician provider holding M.D. credentials at 3291 LOMA VISTA RD, VENTURA, CA, 93003, with a listed phone of (805) 652-6000. NPI 1508082157 was issued on 04/18/2007. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what DORNER most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 351 prescription claims written by this provider, covering 22 Medicare beneficiaries and totaling roughly $31K in drug spend, split 5% brand-name and 95% generic by claim count, with an opioid prescribing rate of 8.8%. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 87.188/100 for the 2023 performance year (Quality 84.0953, Cost 56.5312), compared with the national average of 83.1.

General Practice Physician is a mid-sized specialty nationwide, with 16,677 enrolled providers across 56 states and an average of 2,872 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

3291 LOMA VISTA RD
VENTURA, CA 93003

Provider Details

NPI 1508082157
Specialty General Practice Physician
Credentials M.D.
Gender Female
NPI Issued 04/18/2007

CMS Quality Score (MIPS)

Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.

87.188
Final Score
Avg: 83.1
84.0953
Quality
56.5312
Cost
100
Promoting Interoperability

Reporting: Group practice

Hospital and facility affiliations

Facilities where GILLIAN DORNER, M.D. 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.

COUNTY OF VENTURA
VENTURA, 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 GILLIAN DORNER, M.D.. To verify GILLIAN DORNER, 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 · Generic-heavy

GILLIAN DORNER, M.D. — brand share 5.0%
Specialty average (est.)

5% brand-name claims vs 95% generic, on 351 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.

351
Total Claims
$31K
Total Drug Cost
22
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
673
Total Day Supply
19,610
Brand vs Generic
5% brand / 95% generic
Brand Drug Cost
$24K
Generic Drug Cost
$7K
Opioid Claims
31 (8.8% rate)
Antibiotic Claims
14

Patient Demographics

Average Patient Age
62.3 years
Avg HCC Risk Score
1.09

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

Drug Claims
Levothyroxine Sodium
25
Atorvastatin Calcium
23
Hydrocodone-Acetaminophen
Hydrocodone/Acetaminophen
19
Metformin Hcl
18
Alendronate Sodium
13
Pravastatin Sodium
13
Clonazepam
12
Meloxicam
12
Omeprazole
12
Sertraline Hcl
12

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

General Practice Physician Overview

How GILLIAN DORNER, M.D. fits within the General Practice Physician landscape nationally.

16,677
General Practice Physician Providers in US
56
States with General Practice Physician
2,872
Avg Claims per Provider

GILLIAN DORNER, M.D.'s 351 claims are below the specialty average of 2,872.

Nearby General Practice Physician Providers in California

Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as DORNER.

Compare General Practice Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is GILLIAN DORNER, M.D.'s specialty?
GILLIAN DORNER, M.D. specializes in General Practice Physician and practices in VENTURA, California. Credentials: M.D..
How much does GILLIAN DORNER, M.D. prescribe under Medicare Part D?
In 2023, GILLIAN DORNER, M.D. wrote 351 Medicare Part D claims totaling $31K in drug costs for 22 beneficiaries.
What is GILLIAN DORNER, M.D.'s Medicare quality score?
GILLIAN DORNER, M.D. has a CMS MIPS Final Score of 87.188/100 (Quality: 84.0953, Cost: 56.5312). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is GILLIAN DORNER, M.D. located?
GILLIAN DORNER, M.D. is located at 3291 LOMA VISTA RD, VENTURA, CA, 93003. Phone: (805) 652-6000.
What is GILLIAN DORNER, M.D.'s NPI number?
GILLIAN DORNER, M.D.'s National Provider Identifier (NPI) is 1508082157, issued on 04/18/2007.
Does GILLIAN DORNER, M.D. prescribe more brand-name or generic drugs?
GILLIAN DORNER, M.D.'s prescribing is 5% brand-name and 95% generic drugs by claim count, with $24K in brand drug costs.
Does GILLIAN DORNER, M.D. prescribe opioids?
Yes, GILLIAN DORNER, M.D. had 31 opioid claims in 2023 with an opioid prescribing rate of 8.8%.
How many General Practice Physician providers are there in the US?
There are 16,677 General Practice Physician providers across 56 states in the US. The average General Practice Physician provider writes 2,872 Medicare Part D claims per year.
What drugs does GILLIAN DORNER, M.D. prescribe most often?
Based on 2023 Medicare Part D data, GILLIAN DORNER, M.D.'s most frequently prescribed drugs include Levothyroxine Sodium, Atorvastatin Calcium, Hydrocodone-Acetaminophen. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does GILLIAN DORNER, M.D. accept Medicare?
GILLIAN DORNER, M.D. appears in CMS Medicare data with 351 Part D claims and 22 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify GILLIAN DORNER, M.D.'s credentials?
GILLIAN DORNER, M.D.'s NPI is 1508082157 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

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