NPI registry status
Active
2026 NPPES data Allergy & Immunology (Internal Medicine) Physician NPI 1366400384 MD
Verify on CMS → Andrew Engler, MD
Allergy & Immunology (Internal Medicine) Physician in San Mateo, 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
714
Medicare Part D claims · 221 beneficiaries · Allergy & Immunology (Internal Medicine) Physician avg: 798
Generic prescribing
54%
generic claims · 46% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
78.8/100
▼ 4 pts below national avg 83.1 · Above neutral
Industry payments
$80.48
3 payments · CMS Open Payments (Sunshine Act)
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
Andrew Engler, MD reported a CMS MIPS final score of 78.8/100 - below the 83.1 national average - and filed 714 Medicare Part D claims in 2023.
- 78.8/100
- MIPS score · -4 vs avg
- 714
- Part D claims, 2023
- 54%
- 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.
Andrew Engler, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
79 27th percentile higher than 27% of 477,587 scored providers
Each bar is a band; taller bars hold more scored 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.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Andrew Engler, MD sits
This provider among allergy & immunology (internal medicine) physician peers
Across the 130 allergy & immunology (internal medicine) physician providers who report both Medicare Part D prescribing and a MIPS quality score, Andrew Engler, MD writes more Part D claims than 67% of them and scores higher on MIPS quality than 36% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one allergy & immunology (internal medicine) physician peer from a representative sample of 60; the gold marker is Andrew Engler, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Andrew Engler, 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 Andrew Engler, MD?
Near national averagePrimary specialty
Allergy & Immunology (Internal Medicine) Physician
Medicare Part D claims
714 11% vs specialty avg
MIPS final score
78.8/100 4.3 pts vs avg
Specialty distribution in California
How Allergy & Immunology (Internal Medicine) Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Andrew Engler, MD's 2023 MIPS final score plotted against the Allergy & Immunology (Internal Medicine) Physician national average
- MIPS Final Score
- 78.8/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Allergy & Immunology (Internal Medicine) Physician) - 78.8/100 vs national avg 83.1
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).
Andrew Engler, MD appears in the CMS NPPES registry as a Allergy & Immunology (Internal Medicine) Physician provider holding MD credentials at 290 BALDWIN AVE, San Mateo, CA, 94401, with a listed phone of (650) 343-4597. NPI 1366400384 was issued on 05/01/2006.
Medicare Part D records for calendar year 2023 show 714 prescription claims written by this provider, covering 221 Medicare beneficiaries and totaling roughly $212K in drug spend, split 46% brand-name and 54% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 78.8/100 for the 2023 performance year (Quality 100, Cost 29.5), compared with the national average of 83.1.
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 | 1366400384 |
|---|---|
| Specialty | Allergy & Immunology (Internal Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 05/01/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
78.8404
Final Score
Avg: 83.1
100
Quality
29.468
Cost
Reporting: Individual
Hospital and facility affiliations
Facilities where Andrew Engler, 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.
Allergy And Asthma Clinic Incorporated
San Mateo, 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).
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 Andrew Engler, MD. Source: openpaymentsdata.cms.gov.
Total received
$80
Largest payer
GlaxoSmithKline, LLC.
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 Andrew Engler, MD. To verify Andrew Engler, 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.
Brand vs generic prescribing mix · Above average
Andrew Engler, MD - brand share 46.0%
Allergy & Immunology (Internal Medicine) Physician average
46% brand-name claims vs 54% generic, on 714 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.
714
Total Claims
$212K
Total Drug Cost
221
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,102
- Total Day Supply
- 30,964
- Brand vs Generic
- 46% brand / 54% generic
- Brand Drug Cost
- $180K
- Generic Drug Cost
- $32K
Patient Demographics
- Average Patient Age
- 74.6 years
- Avg HCC Risk Score
- 0.96
- Gender Split
- 64% female / 36% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Andrew Engler, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Epinephrine
Epinephrine
116 claims
- Montelukast Sodium
Montelukast Sodium
115 claims
- Albuterol Sulfate … 46
Albuterol Sulfate Hfa
46 claims
- Symbicort 45
Symbicort
45 claims
- Fluticasone Propio… 43
Fluticasone Propionate
43 claims
- Azelastine Hcl 37
Azelastine Hcl
37 claims
- Ipratropium Bromide 32
Ipratropium Bromide
32 claims
- Breo Ellipta 30
Breo Ellipta
30 claims
| Drug | Claims |
|---|---|
| Epinephrine | 116 |
| Montelukast Sodium | 115 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 46 |
| Symbicort Budesonide/Formoterol Fumarate | 45 |
| Fluticasone Propionate | 43 |
| Azelastine Hcl | 37 |
| Ipratropium Bromide | 32 |
| Breo Ellipta Fluticasone/Vilanterol | 30 |
| Flovent Hfa Fluticasone Propionate | 22 |
| Olopatadine Hcl | 20 |
* 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 Andrew Engler, MD 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
Andrew Engler, MD's 714 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 Engler.
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 Andrew Engler, MD's specialty? ▼
Andrew Engler, MD specializes in Allergy & Immunology (Internal Medicine) Physician and practices in San Mateo, California. Credentials: MD.
How much does Andrew Engler, MD prescribe under Medicare Part D? ▼
In 2023, Andrew Engler, MD wrote 714 Medicare Part D claims totaling $212K in drug costs for 221 beneficiaries.
What is Andrew Engler, MD's Medicare quality score? ▼
Andrew Engler, MD has a CMS MIPS Final Score of 78.8/100 (Quality: 100, Cost: 29.5). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Andrew Engler, MD located? ▼
Andrew Engler, MD is located at 290 BALDWIN AVE, San Mateo, CA, 94401. Phone: (650) 343-4597.
What is Andrew Engler, MD's NPI number? ▼
Andrew Engler, MD's National Provider Identifier (NPI) is 1366400384, issued on 05/01/2006.
Does Andrew Engler, MD prescribe more brand-name or generic drugs? ▼
Andrew Engler, MD's prescribing is 46% brand-name and 54% generic drugs by claim count, with $180K 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 Andrew Engler, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Andrew Engler, MD's most frequently prescribed drugs include Epinephrine, Montelukast Sodium, Albuterol Sulfate Hfa. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Andrew Engler, MD accept Medicare? ▼
Andrew Engler, MD appears in CMS Medicare data with 714 Part D claims and 221 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Andrew Engler, MD's credentials? ▼
Andrew Engler, MD's NPI is 1366400384 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
Compiled from official public sources by the PlainDoctor editorial team.