NPI registry status
Active
2026 NPPES data Emergency Medicine Physician NPI 1548897325 MD
Verify on CMS → Diana Halloran, MD
Emergency Medicine Physician in Indianapolis, Indiana.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 64,398 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
39
Medicare Part D claims · 26 beneficiaries · Emergency Medicine Physician avg: 352
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Diana Halloran, MD filed 39 Medicare Part D claims in 2023 as a Emergency Medicine Physician in Indianapolis, Indiana.
- 39
- 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.
Diana Halloran, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
39 0th percentile higher than 0% 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)
Diana Halloran, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 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 Diana Halloran, MD?
Quality data not reportedPrimary specialty
Emergency Medicine Physician
Medicare Part D claims
39 89% vs specialty avg
Specialty distribution in Indiana
How Emergency Medicine Physician compares to other specialties among Indiana 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).
Diana Halloran, MD appears in the CMS NPPES registry as a Emergency Medicine Physician provider holding MD credentials at 720 ESKENAZI AVE FL 2, Indianapolis, IN, 46202, with a listed phone of (317) 278-5316. NPI 1548897325 was issued on 03/24/2020.
Medicare Part D records for calendar year 2023 show 39 prescription claims written by this provider, covering 26 Medicare beneficiaries and totaling roughly $441 in drug spend.
Emergency Medicine Physician is a high-volume specialty nationwide, with 64,398 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 | 1548897325 |
|---|---|
| Specialty | Emergency Medicine Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 03/24/2020 |
Hospital and facility affiliations
Facilities where Diana Halloran, 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.
Sutter Bay Medical Foundation
Berkeley, 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).
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
39
Total Claims
$441
Total Drug Cost
26
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 41
- Total Day Supply
- 549
- Generic Drug Cost
- $429
- Antibiotic Claims
- 17
Patient Demographics
- Average Patient Age
- 73.6 years
- Avg HCC Risk Score
- 2.49
- Gender Split
- 50% female / 50% male
Emergency Medicine Physician Overview
How Diana Halloran, MD fits within the Emergency Medicine Physician landscape nationally.
64,398
Emergency Medicine Physician Providers in US
56
States with Emergency Medicine Physician
352
Avg Claims per Provider
Diana Halloran, MD's 39 claims are below the specialty average of 352.
Nearby Emergency Medicine Physician Providers in Indiana
Other clinicians with the same primary specialty enrolled in Indiana, drawn from the same CMS NPPES roster as Halloran.
Dr. Danyelle Aber
M.D.
Fort Wayne, IN
Dr. Jennifer Acciani
M.D.
Indianapolis, IN
Dr. Robert Adams
DO
Paoli, IN
Dr. Chris Adamson
MD
Bedford, IN
Dr. Manisha Agarwala
MD
Carmel, IN
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 Indiana 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.
Healthcare Guides
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How to Find a Doctor
Step-by-step guide to choosing a provider
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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 Indiana
Frequently Asked Questions
What is Diana Halloran, MD's specialty? ▼
Diana Halloran, MD specializes in Emergency Medicine Physician and practices in Indianapolis, Indiana. Credentials: MD.
How much does Diana Halloran, MD prescribe under Medicare Part D? ▼
In 2023, Diana Halloran, MD wrote 39 Medicare Part D claims totaling $441 in drug costs for 26 beneficiaries.
Where is Diana Halloran, MD located? ▼
Diana Halloran, MD is located at 720 ESKENAZI AVE FL 2, Indianapolis, IN, 46202. Phone: (317) 278-5316.
What is Diana Halloran, MD's NPI number? ▼
Diana Halloran, MD's National Provider Identifier (NPI) is 1548897325, issued on 03/24/2020.
How many Emergency Medicine Physician providers are there in the US? ▼
There are 64,398 Emergency Medicine Physician providers across 56 states in the US. The average Emergency Medicine Physician provider writes 352 Medicare Part D claims per year.
Does Diana Halloran, MD accept Medicare? ▼
Diana Halloran, MD appears in CMS Medicare data with 39 Part D claims and 26 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Diana Halloran, MD's credentials? ▼
Diana Halloran, MD's NPI is 1548897325 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.
- 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.