NPI registry status
Active
2026 NPPES data Student in an Organized Health Care Education/Training Program NPI 1538428685 M.D.
Verify on CMS → Myfanwy Callahan, M.D.
Student in an Organized Health Care Education/Training Program in Medford, Massachusetts.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 331,274 in Student in an Organized Health Care Education/Training Program, 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
9K
Medicare Part D claims · 841 beneficiaries · Student in an Organized Health Care Education/Training Program avg: 459
Generic prescribing
87%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$31.61
1 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Myfanwy Callahan, M.D. filed 9,080 Medicare Part D claims in 2023 as a Student in an Organized Health Care Education/Training Program in Medford, Massachusetts, prescribing 87% generic.
- 9K
- Part D claims, 2023
- 87%
- generic prescribing
- $31.61
- industry payments (Sunshine Act)
- ≥98th
- pct by Part D claim volume (lower-bound band)
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.
Myfanwy Callahan, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
9,080 ≥ 98th percentile 98% of 1,370,886 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
What does the federal data show about Myfanwy Callahan, M.D.?
Quality data not reportedPrimary specialty
Student in an Organized Health Care Education/Training Program
Medicare Part D claims
9,080 20× vs specialty avg
Specialty distribution in Massachusetts
How Student in an Organized Health Care Education/Training Program compares to other specialties among Massachusetts 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 Student in an Organized Health Care Education/Training Program. 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).
Myfanwy Callahan, M.D. appears in the CMS NPPES registry as a Student in an Organized Health Care Education/Training Program provider holding M.D. credentials at 26 CITY HALL MALL, Medford, MA, 02155, with a listed phone of (781) 306-5130. NPI 1538428685 was issued on 05/10/2012.
Medicare Part D records for calendar year 2023 show 9,080 prescription claims written by this provider, covering 841 Medicare beneficiaries and totaling roughly $1.0 million in drug spend, split 12% brand-name and 87% generic by claim count, with an opioid prescribing rate of 6.2%.
Student in an Organized Health Care Education/Training Program is a high-volume specialty nationwide, with 331,274 enrolled providers across 55 states and an average of 459 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 | 1538428685 |
|---|---|
| Specialty | Student in an Organized Health Care Education/Training Program |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 05/10/2012 |
Hospital and facility affiliations
Facilities where Myfanwy Callahan, 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.
Atrius Health Inc
Medford, MA
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 Myfanwy Callahan, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$32
Largest payer
Abbott Laboratories
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 - Massachusetts BORIM 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 ~38K Massachusetts medical licensees in 2023 - they are NOT specific to Myfanwy Callahan, M.D.. To verify Myfanwy Callahan, M.D.'s current license status, search the BORIM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
80
Total board actions, Massachusetts 2023
Across 78 cases
2.11
Actions per 1,000 licensees
Massachusetts statewide rate
probation
Most common action type
29 cases
BORIM 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 Massachusetts disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Myfanwy Callahan, M.D. - brand share 12.0%
Student in an Organized Health Care Education/Training Program average
12% brand-name claims vs 87% generic, on 9,080 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.
9,080
Total Claims
$1.0M
Total Drug Cost
841
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 19,022
- Total Day Supply
- 546,579
- Brand vs Generic
- 12% brand / 87% generic
- Brand Drug Cost
- $810K
- Generic Drug Cost
- $188K
- Opioid Claims
- 561 (6.2% rate)
- Antibiotic Claims
- 147
Patient Demographics
- Average Patient Age
- 73.4 years
- Avg HCC Risk Score
- 1.20
- Gender Split
- 67% female / 33% male
- Age Distribution
- <65: 78, 65-74: 387, 75-84: 276, 85+: 100
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Myfanwy Callahan, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
542 claims
- Levothyroxine Sodium
Levothyroxine Sodium
314 claims
- Amlodipine Besylate
Amlodipine Besylate
285 claims
- Omeprazole
Omeprazole
279 claims
- Simvastatin
Simvastatin
271 claims
- Lisinopril
Lisinopril
260 claims
- Oxycodone Hcl
Oxycodone Hcl
254 claims
- Lorazepam
Lorazepam
248 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 542 |
| Levothyroxine Sodium | 314 |
| Amlodipine Besylate | 285 |
| Omeprazole | 279 |
| Simvastatin | 271 |
| Lisinopril | 260 |
| Oxycodone Hcl | 254 |
| Lorazepam | 248 |
| Losartan Potassium | 247 |
| Gabapentin | 246 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Student in an Organized Health Care Education/Training Program in MA →
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Student in an Organized Health Care Education/Training Program Overview
How Myfanwy Callahan, M.D. fits within the Student in an Organized Health Care Education/Training Program landscape nationally.
331,274
Student in an Organized Health Care Education/Training Program Providers in US
55
States with Student in an Organized Health Care Education/Training Program
459
Avg Claims per Provider
Myfanwy Callahan, M.D.'s 9,080 claims are above the specialty average of 459.
Nearby Student in an Organized Health Care Education/Training Program Providers in Massachusetts
Other clinicians with the same primary specialty enrolled in Massachusetts, drawn from the same CMS NPPES roster as Callahan.
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 Massachusetts medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Student in an Organized Health Care Education/Training Program 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 Myfanwy Callahan, M.D.'s specialty? ▼
Myfanwy Callahan, M.D. specializes in Student in an Organized Health Care Education/Training Program and practices in Medford, Massachusetts. Credentials: M.D..
How much does Myfanwy Callahan, M.D. prescribe under Medicare Part D? ▼
In 2023, Myfanwy Callahan, M.D. wrote 9,080 Medicare Part D claims totaling $1.0M in drug costs for 841 beneficiaries.
Where is Myfanwy Callahan, M.D. located? ▼
Myfanwy Callahan, M.D. is located at 26 CITY HALL MALL, Medford, MA, 02155. Phone: (781) 306-5130.
What is Myfanwy Callahan, M.D.'s NPI number? ▼
Myfanwy Callahan, M.D.'s National Provider Identifier (NPI) is 1538428685, issued on 05/10/2012.
Does Myfanwy Callahan, M.D. prescribe more brand-name or generic drugs? ▼
Myfanwy Callahan, M.D.'s prescribing is 12% brand-name and 87% generic drugs by claim count, with $810K in brand drug costs.
Does Myfanwy Callahan, M.D. prescribe opioids? ▼
Yes, Myfanwy Callahan, M.D. had 561 opioid claims in 2023 with an opioid prescribing rate of 6.2%.
How many Student in an Organized Health Care Education/Training Program providers are there in the US? ▼
There are 331,274 Student in an Organized Health Care Education/Training Program providers across 55 states in the US. The average Student in an Organized Health Care Education/Training Program provider writes 459 Medicare Part D claims per year.
What drugs does Myfanwy Callahan, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Myfanwy Callahan, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Levothyroxine Sodium, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Myfanwy Callahan, M.D. accept Medicare? ▼
Myfanwy Callahan, M.D. appears in CMS Medicare data with 9,080 Part D claims and 841 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Myfanwy Callahan, M.D.'s credentials? ▼
Myfanwy Callahan, M.D.'s NPI is 1538428685 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
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.