NPI registry status
Active
2026 NPPES data Allergy & Immunology (Internal Medicine) Physician NPI 1306080270 M.D.
Verify on CMS → Corinne Happel, M.D.
Allergy & Immunology (Internal Medicine) Physician in Baltimore, Maryland.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 517 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
33
Medicare Part D claims · Allergy & Immunology (Internal Medicine) Physician avg: 798
MIPS score
74.4/100
▼ 9 pts below national avg 83.1 · Mid-tier
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Corinne Happel, M.D. reported a CMS MIPS final score of 74.4/100 - below the 83.1 national average - and filed 33 Medicare Part D claims in 2023.
- 74.4/100
- MIPS score · -9 vs avg
- 33
- Part D claims, 2023
- 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.
Corinne Happel, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
74 12th percentile higher than 12% 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 Corinne Happel, M.D. 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, Corinne Happel, M.D. writes more Part D claims than 2% of them and scores higher on MIPS quality than 11% - placing this provider in the lower-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 Corinne Happel, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Corinne Happel, 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).
What does the federal data show about Corinne Happel, M.D.?
Below national averagePrimary specialty
Allergy & Immunology (Internal Medicine) Physician
Medicare Part D claims
33 96% vs specialty avg
MIPS final score
74.4/100 8.7 pts vs avg
Specialty distribution in Maryland
How Allergy & Immunology (Internal Medicine) Physician compares to other specialties among Maryland providers
Medicare quality performance, MIPS
Corinne Happel, M.D.'s 2023 MIPS final score plotted against the Allergy & Immunology (Internal Medicine) Physician national average
- MIPS Final Score
- 74.4/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Allergy & Immunology (Internal Medicine) Physician) - 74.4/100 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).
Corinne Happel, M.D. appears in the CMS NPPES registry as an Allergy & Immunology (Internal Medicine) Physician provider holding M.D. credentials at 5501 HOPKINS BAYVIEW CIR, Baltimore, MD, 21224, with a listed phone of (410) 550-2300. NPI 1306080270 was issued on 04/23/2009.
Medicare Part D records for calendar year 2023 show 33 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $14K in drug spend. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 74.4/100 for the 2023 performance year (Quality 64.7, Cost 52.4), compared with the national average of 83.1.
Allergy & Immunology (Internal Medicine) Physician is a narrow specialty nationwide, with 517 enrolled providers across 47 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 | 1306080270 |
|---|---|
| Specialty | Allergy & Immunology (Internal Medicine) Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 04/23/2009 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
74.3962
Final Score
Avg: 83.1
64.7185
Quality
52.4354
Cost
97
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Corinne Happel, 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.
Johns Hopkins University
Baltimore, MD
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
33
Total Claims
$14K
Total Drug Cost
N/A
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 48
- Total Day Supply
- 1,410
- Generic Drug Cost
- $1K
Patient Demographics
- Average Patient Age
- 62.4 years
- Avg HCC Risk Score
- 1.21
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Ipratropium Bromide | 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 MD →
All providers in Maryland →
Compare specialties →
Allergy & Immunology (Internal Medicine) Physician Overview
How Corinne Happel, M.D. fits within the Allergy & Immunology (Internal Medicine) Physician landscape nationally.
517
Allergy & Immunology (Internal Medicine) Physician Providers in US
47
States with Allergy & Immunology (Internal Medicine) Physician
798
Avg Claims per Provider
Corinne Happel, M.D.'s 33 claims are below the specialty average of 798.
Nearby Allergy & Immunology (Internal Medicine) Physician Providers in Maryland
Other clinicians with the same primary specialty enrolled in Maryland, drawn from the same CMS NPPES roster as Happel.
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 Maryland 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.
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Maryland
Frequently Asked Questions
What is Corinne Happel, M.D.'s specialty? ▼
Corinne Happel, M.D. specializes in Allergy & Immunology (Internal Medicine) Physician and practices in Baltimore, Maryland. Credentials: M.D..
How much does Corinne Happel, M.D. prescribe under Medicare Part D? ▼
In 2023, Corinne Happel, M.D. wrote 33 Medicare Part D claims totaling $14K in drug costs for N/A beneficiaries.
What is Corinne Happel, M.D.'s Medicare quality score? ▼
Corinne Happel, M.D. has a CMS MIPS Final Score of 74.4/100 (Quality: 64.7, Cost: 52.4). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Corinne Happel, M.D. located? ▼
Corinne Happel, M.D. is located at 5501 HOPKINS BAYVIEW CIR, Baltimore, MD, 21224. Phone: (410) 550-2300.
What is Corinne Happel, M.D.'s NPI number? ▼
Corinne Happel, M.D.'s National Provider Identifier (NPI) is 1306080270, issued on 04/23/2009.
How many Allergy & Immunology (Internal Medicine) Physician providers are there in the US? ▼
There are 517 Allergy & Immunology (Internal Medicine) Physician providers across 47 states in the US. The average Allergy & Immunology (Internal Medicine) Physician provider writes 798 Medicare Part D claims per year.
What drugs does Corinne Happel, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Corinne Happel, M.D.'s most frequently prescribed drugs include Ipratropium Bromide. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Corinne Happel, M.D. accept Medicare? ▼
Corinne Happel, M.D. appears in CMS Medicare data with 33 Part D claims and N/A Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Corinne Happel, M.D.'s credentials? ▼
Corinne Happel, M.D.'s NPI is 1306080270 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.
- 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.
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.