NPI registry status
Active
2026 NPPES data Allergy & Immunology (Internal Medicine) Physician NPI 1508886235 M.D.
Verify on CMS → Shields Abernathy, M.D.
Allergy & Immunology (Internal 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 520 in Allergy & Immunology (Internal 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
115
Medicare Part D claims · 37 beneficiaries · Allergy & Immunology (Internal Medicine) Physician avg: 798
Generic prescribing
71%
generic claims · 29% 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
Shields Abernathy, M.D. filed 115 Medicare Part D claims in 2023 as a Allergy & Immunology (Internal Medicine) Physician in Templeton, California, prescribing 71% generic.
- 115
- Part D claims, 2023
- 71%
- generic prescribing
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.
Shields Abernathy, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
115 35th percentile higher than 35% 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
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Board-eligible specialty (heuristic, not verified)
Shields Abernathy, 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 Shields Abernathy, M.D.?
Quality data not reportedPrimary specialty
Allergy & Immunology (Internal Medicine) Physician
Medicare Part D claims
115 86% vs specialty avg
Specialty distribution in California
How Allergy & Immunology (Internal 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 Allergy & Immunology (Internal 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).
Shields Abernathy, M.D. appears in the CMS NPPES registry as a Allergy & Immunology (Internal Medicine) Physician provider holding M.D. credentials at 1050 LAS TABLAS RD, Templeton, CA, 93465, with a listed phone of (805) 434-1000. NPI 1508886235 was issued on 07/19/2006.
Medicare Part D records for calendar year 2023 show 115 prescription claims written by this provider, covering 37 Medicare beneficiaries and totaling roughly $30K in drug spend, split 29% brand-name and 71% generic by claim count.
Allergy & Immunology (Internal Medicine) Physician is a narrow specialty nationwide, with 520 enrolled providers across 48 states and an average of 798 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 | 1508886235 |
|---|---|
| Specialty | Allergy & Immunology (Internal Medicine) Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 07/19/2006 |
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 Shields Abernathy, M.D.. To verify Shields Abernathy, 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 · Above average
Shields Abernathy, M.D. - brand share 29.0%
Allergy & Immunology (Internal Medicine) Physician average
29% brand-name claims vs 71% generic, on 115 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.
115
Total Claims
$30K
Total Drug Cost
37
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 278
- Total Day Supply
- 8,169
- Brand vs Generic
- 29% brand / 71% generic
- Brand Drug Cost
- $27K
- Generic Drug Cost
- $3K
Patient Demographics
- Average Patient Age
- 72.1 years
- Avg HCC Risk Score
- 1.22
- Gender Split
- 49% female / 51% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Montelukast Sodium | 23 |
| Trelegy Ellipta Fluticasone/Umeclidin/Vilanter | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Allergy & Immunology (Internal Medicine) Physician in CA →
All providers in California →
Compare specialties →
Allergy & Immunology (Internal Medicine) Physician Overview
How Shields Abernathy, M.D. fits within the Allergy & Immunology (Internal Medicine) Physician landscape nationally.
520
Allergy & Immunology (Internal Medicine) Physician Providers in US
48
States with Allergy & Immunology (Internal Medicine) Physician
798
Avg Claims per Provider
Shields Abernathy, M.D.'s 115 claims are below the specialty average of 798.
Nearby Allergy & Immunology (Internal Medicine) Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Abernathy.
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 Allergy & Immunology (Internal 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 Shields Abernathy, M.D.'s specialty? ▼
Shields Abernathy, M.D. specializes in Allergy & Immunology (Internal Medicine) Physician and practices in Templeton, California. Credentials: M.D..
How much does Shields Abernathy, M.D. prescribe under Medicare Part D? ▼
In 2023, Shields Abernathy, M.D. wrote 115 Medicare Part D claims totaling $30K in drug costs for 37 beneficiaries.
Where is Shields Abernathy, M.D. located? ▼
Shields Abernathy, M.D. is located at 1050 LAS TABLAS RD, Templeton, CA, 93465. Phone: (805) 434-1000.
What is Shields Abernathy, M.D.'s NPI number? ▼
Shields Abernathy, M.D.'s National Provider Identifier (NPI) is 1508886235, issued on 07/19/2006.
Does Shields Abernathy, M.D. prescribe more brand-name or generic drugs? ▼
Shields Abernathy, M.D.'s prescribing is 29% brand-name and 71% generic drugs by claim count, with $27K in brand drug costs.
How many Allergy & Immunology (Internal Medicine) Physician providers are there in the US? ▼
There are 520 Allergy & Immunology (Internal Medicine) Physician providers across 48 states in the US. The average Allergy & Immunology (Internal Medicine) Physician provider writes 798 Medicare Part D claims per year.
What drugs does Shields Abernathy, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Shields Abernathy, M.D.'s most frequently prescribed drugs include Montelukast Sodium, Trelegy Ellipta. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Shields Abernathy, M.D. accept Medicare? ▼
Shields Abernathy, M.D. appears in CMS Medicare data with 115 Part D claims and 37 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Shields Abernathy, M.D.'s credentials? ▼
Shields Abernathy, M.D.'s NPI is 1508886235 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
Compiled from official public sources by the PlainDoctor editorial team.