NPI registry status
Active
2026 NPPES data Emergency Medicine Physician NPI 1538331137 DO
Verify on CMS → Ryan McCallum, DO
Emergency Medicine Physician in Show Low, Arizona.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 66,293 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
139
Medicare Part D claims · 93 beneficiaries · Emergency Medicine Physician avg: 355
Generic prescribing
91%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Ryan McCallum, DO filed 139 Medicare Part D claims in 2024 as an Emergency Medicine Physician in Show Low, Arizona, prescribing 91% generic.
- 139
- Part D claims, 2024
- 91%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥34th
- 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.
Federal trust snapshot
What official records show about Ryan McCallum, DO
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1538331137), first enumerated 03/24/2008.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 139 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1538331137 · Emergency Medicine Physician
NPI-10 · ENUM-MID · TAX-MEGA · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1538331137
- ENUM-MID 2008
- TAX-MEGA 66K Emergency Medicine
- RX-LIGHT 139
- BOOK-LIGHT 1,419 in Arizona
- PHOTO-ENUM Anwar Osborne, M.D. · 2008
Ryan McCallum, DO's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
139 ≥ 34th percentile 34% of 1,416,883 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 · 2024
✓
Board certification likely (heuristic, not verified)
Ryan McCallum, DO 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 Ryan McCallum, DO?
Quality data not reportedPrimary specialty
Emergency Medicine Physician
Medicare Part D claims
139 61% vs specialty avg
Specialty distribution in Arizona
How Emergency Medicine Physician compares to other specialties among Arizona 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).
Practice Address
Provider Details
| NPI | 1538331137 |
|---|---|
| Specialty | Emergency Medicine Physician |
| Credentials | DO |
| Gender | Male |
| NPI Issued | 03/24/2008 |
Hospital and facility affiliations
Facilities where Ryan McCallum, DO 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.
Dhhs Ihs Phoenix Area
Whiteriver, AZ
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Generic-heavy
Ryan McCallum, DO - brand share 9.0%
Emergency Medicine Physician average
9% brand-name claims vs 91% generic, on 139 2024 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 2024.
139
Total Claims
$3K
Total Drug Cost
93
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 141
- Total Day Supply
- 1,360
- Brand vs Generic
- 9% brand / 91% generic
- Brand Drug Cost
- $2K
- Generic Drug Cost
- $1K
- Antibiotic Claims
- 62
Patient Demographics
- Average Patient Age
- 69.1 years
- Avg HCC Risk Score
- 1.71
- Gender Split
- 57% female / 43% male
- Age Distribution
- <65: 24, 65-74: 36, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Prednisone | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Emergency Medicine Physician Overview
How Ryan McCallum, DO fits within the Emergency Medicine Physician landscape nationally.
66,293
Emergency Medicine Physician Providers in US
56
States with Emergency Medicine Physician
355
Avg Claims per Provider
Ryan McCallum, DO's 139 claims are below the specialty average of 355.
Nationwide Emergency Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for McCallum, both outside Arizona so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2008)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Emergency Medicine Physician Providers in Arizona
Other clinicians with the same primary specialty enrolled in Arizona, drawn from the same CMS NPPES roster as McCallum.
One of 1,419 Emergency Medicine Physician providers enrolled in Arizona, 5 are shown here.
Dr. Dimyana Abdelmalek
MD
Chinle, AZ
Dr. Linda Abernathy
MD
Tuba City, AZ
Dr. Sameer Aboufadel
DO, MPH
Tucson, AZ
Dr. Josephine Acuna
M.D
Tucson, AZ
Dr. Norberto Adame
MD
Phoenix, AZ
Compare Emergency Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Ryan McCallum, DO's specialty? ▼
Ryan McCallum, DO specializes in Emergency Medicine Physician and practices in Show Low, Arizona. Credentials: DO.
How much does Ryan McCallum, DO prescribe under Medicare Part D? ▼
In 2024, Ryan McCallum, DO wrote 139 Medicare Part D claims totaling $3K in drug costs for 93 beneficiaries.
Where is Ryan McCallum, DO located? ▼
Ryan McCallum, DO is located at 2200 E SHOW LOW LAKE RD, Show Low, AZ, 85901. Phone: (928) 537-6371.
What is Ryan McCallum, DO's NPI number? ▼
Ryan McCallum, DO's National Provider Identifier (NPI) is 1538331137, issued on 03/24/2008.
Does Ryan McCallum, DO prescribe more brand-name or generic drugs? ▼
Ryan McCallum, DO's prescribing is 9% brand-name and 91% generic drugs by claim count, with $2K in brand drug costs.
How many Emergency Medicine Physician providers are there in the US? ▼
There are 66,293 Emergency Medicine Physician providers across 56 states in the US. The average Emergency Medicine Physician provider writes 355 Medicare Part D claims per year.
What drugs does Ryan McCallum, DO prescribe most often? ▼
Based on 2024 Medicare Part D data, Ryan McCallum, DO's most frequently prescribed drugs include Prednisone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ryan McCallum, DO accept Medicare? ▼
Ryan McCallum, DO appears in CMS Medicare data with 139 Part D claims and 93 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ryan McCallum, DO's credentials? ▼
Ryan McCallum, DO's NPI is 1538331137 with credentials DO. 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 (2024). 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 August 2026 (NPPES) / 2024 (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 August 2026.