NPI registry status
Active
2026 NPPES data Radiation Oncology Physician NPI 1194089441 M.D.
Verify on CMS → Mark Zaki, M.D.
Radiation Oncology Physician in Saginaw, Michigan.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 6,029 in Radiation Oncology 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
158
Medicare Part D claims · 75 beneficiaries · Radiation Oncology Physician avg: 186
Industry payments
$185.08
2 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Mark Zaki, M.D. filed 158 Medicare Part D claims in 2023 as a Radiation Oncology Physician in Saginaw, Michigan.
- 158
- 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.
Mark Zaki, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
158 35th percentile higher than 35% 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)
Mark Zaki, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations - 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 Mark Zaki, M.D.?
Quality data not reportedPrimary specialty
Radiation Oncology Physician
Medicare Part D claims
158 15% vs specialty avg
Specialty distribution in Michigan
How Radiation Oncology Physician compares to other specialties among Michigan 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 Radiation Oncology 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).
Mark Zaki, M.D. appears in the CMS NPPES registry as a Radiation Oncology Physician provider holding M.D. credentials at 5400 MACKINAW RD, Saginaw, MI, 48604, with a listed phone of (989) 583-5250. NPI 1194089441 was issued on 07/02/2012.
Medicare Part D records for calendar year 2023 show 158 prescription claims written by this provider, covering 75 Medicare beneficiaries and totaling roughly $4K in drug spend, with an opioid prescribing rate of 16.5%.
Radiation Oncology Physician is a mid-sized specialty nationwide, with 6,029 enrolled providers across 53 states and an average of 186 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 | 1194089441 |
|---|---|
| Specialty | Radiation Oncology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 07/02/2012 |
Hospital and facility affiliations
Facilities where Mark Zaki, 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.
Covenant Medical Center, Inc.
Saginaw, MI
Marlette Regional Hospital
Marlette, MI
Critical Access Hospitals
CMS CCN: 231330
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 Mark Zaki, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$185
Largest payer
Globus Medical, Inc.
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 - Michigan MI-BOM 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 ~41K Michigan medical licensees in 2023 - they are NOT specific to Mark Zaki, M.D.. To verify Mark Zaki, M.D.'s current license status, search the MI-BOM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
123
Total board actions, Michigan 2023
Across 120 cases
3.00
Actions per 1,000 licensees
Michigan statewide rate
probation
Most common action type
44 cases
MI-BOM 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 Michigan disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
158
Total Claims
$4K
Total Drug Cost
75
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 176
- Total Day Supply
- 3,212
- Generic Drug Cost
- $4K
- Opioid Claims
- 26 (16.5% rate)
Patient Demographics
- Average Patient Age
- 72.5 years
- Avg HCC Risk Score
- 1.79
- Gender Split
- 44% female / 56% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Mark Zaki, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
23 claims
- Lidocaine Hcl Visc…
Lidocaine Hcl Viscous
23 claims
- Omeprazole
Omeprazole
15 claims
- Tamsulosin Hcl
Tamsulosin Hcl
14 claims
| Drug | Claims |
|---|---|
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 23 |
| Lidocaine Hcl Viscous Lidocaine Hcl | 23 |
| Omeprazole | 15 |
| Tamsulosin Hcl | 14 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Radiation Oncology Physician Overview
How Mark Zaki, M.D. fits within the Radiation Oncology Physician landscape nationally.
6,029
Radiation Oncology Physician Providers in US
53
States with Radiation Oncology Physician
186
Avg Claims per Provider
Mark Zaki, M.D.'s 158 claims are below the specialty average of 186.
Nearby Radiation Oncology Physician Providers in Michigan
Other clinicians with the same primary specialty enrolled in Michigan, drawn from the same CMS NPPES roster as Zaki.
Dr. Eyad Abu-Isa
M.D.
Novi, MI
Dr. Khurshid Ahmad
M.D.
Saginaw, MI
Dr. Michael Aja
MD
Travese City, MI
Dr. Munther Ajlouni
M.D.
Grosse Pointe Park, MI
Dr. Hani Al Halabi
MDCM
Flint, MI
Compare Radiation Oncology 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 Michigan medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Radiation Oncology 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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Medical Specialties Explained
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Frequently Asked Questions
What is Mark Zaki, M.D.'s specialty? ▼
Mark Zaki, M.D. specializes in Radiation Oncology Physician and practices in Saginaw, Michigan. Credentials: M.D..
How much does Mark Zaki, M.D. prescribe under Medicare Part D? ▼
In 2023, Mark Zaki, M.D. wrote 158 Medicare Part D claims totaling $4K in drug costs for 75 beneficiaries.
Where is Mark Zaki, M.D. located? ▼
Mark Zaki, M.D. is located at 5400 MACKINAW RD, Saginaw, MI, 48604. Phone: (989) 583-5250.
What is Mark Zaki, M.D.'s NPI number? ▼
Mark Zaki, M.D.'s National Provider Identifier (NPI) is 1194089441, issued on 07/02/2012.
Does Mark Zaki, M.D. prescribe opioids? ▼
Yes, Mark Zaki, M.D. had 26 opioid claims in 2023 with an opioid prescribing rate of 16.5%.
How many Radiation Oncology Physician providers are there in the US? ▼
There are 6,029 Radiation Oncology Physician providers across 53 states in the US. The average Radiation Oncology Physician provider writes 186 Medicare Part D claims per year.
What drugs does Mark Zaki, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Mark Zaki, M.D.'s most frequently prescribed drugs include Hydrocodone-Acetaminophen, Lidocaine Hcl Viscous, Omeprazole. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Zaki, M.D. accept Medicare? ▼
Mark Zaki, M.D. appears in CMS Medicare data with 158 Part D claims and 75 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Zaki, M.D.'s credentials? ▼
Mark Zaki, M.D.'s NPI is 1194089441 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
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.