NPI registry status
Active
2026 NPPES data Psychiatry Physician NPI 1275621807 M.D.
Verify on CMS → Matt Zak, M.D.
Psychiatry Physician in De Pere, Wisconsin.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 53,171 in Psychiatry 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
586
Medicare Part D claims · 55 beneficiaries · Psychiatry Physician avg: 1K
Generic prescribing
96%
generic claims · 4% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
94.6/100
▲ 12 pts above national avg 83.1 · Exceptional
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Matt Zak, M.D. reported a CMS MIPS final score of 94.6/100 - above the 83.1 national average - and filed 586 Medicare Part D claims in 2023.
- 94.6/100
- MIPS score · +12 vs avg
- 586
- Part D claims, 2023
- 96%
- generic prescribing
- 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.
Matt Zak, 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
95 Top 25% higher than 75% 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 Matt Zak, M.D. sits
This provider among psychiatry physician peers
Across the 4,659 psychiatry physician providers who report both Medicare Part D prescribing and a MIPS quality score, Matt Zak, M.D. writes more Part D claims than 57% of them and scores higher on MIPS quality than 77% - placing this provider in the high-volume, high-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 psychiatry physician peer from a representative sample of 60; the gold marker is Matt Zak, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Matt Zak, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 Matt Zak, M.D.?
High performer (top quartile)Primary specialty
Psychiatry Physician
Medicare Part D claims
586 44% vs specialty avg
MIPS final score
94.6/100 11.5 pts vs avg
Specialty distribution in Wisconsin
How Psychiatry Physician compares to other specialties among Wisconsin providers
Medicare quality performance, MIPS
Matt Zak, M.D.'s 2023 MIPS final score plotted against the Psychiatry Physician national average
- MIPS Final Score
- 94.6/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Psychiatry Physician) - 94.6/100 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).
Matt Zak, M.D. appears in the CMS NPPES registry as a Psychiatry Physician provider holding M.D. credentials at 3860 MONROE RD, De Pere, WI, 54115, with a listed phone of (920) 496-4700. NPI 1275621807 was issued on 10/10/2006.
Medicare Part D records for calendar year 2023 show 586 prescription claims written by this provider, covering 55 Medicare beneficiaries and totaling roughly $45K in drug spend, split 4% brand-name and 96% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 94.6/100 for the 2023 performance year (Quality 85.2), compared with the national average of 83.1.
Psychiatry Physician is a high-volume specialty nationwide, with 53,171 enrolled providers across 56 states and an average of 1,038 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 | 1275621807 |
|---|---|
| Specialty | Psychiatry Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 10/10/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
94.6154
Final Score
Avg: 83.1
85.1795
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
Brand vs generic prescribing mix · Generic-heavy
Matt Zak, M.D. - brand share 4.0%
Psychiatry Physician average
4% brand-name claims vs 96% generic, on 586 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.
586
Total Claims
$45K
Total Drug Cost
55
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 688
- Total Day Supply
- 20,289
- Brand vs Generic
- 4% brand / 96% generic
- Brand Drug Cost
- $28K
- Generic Drug Cost
- $17K
Patient Demographics
- Average Patient Age
- 54.6 years
- Avg HCC Risk Score
- 1.28
- Gender Split
- 53% female / 47% male
- Age Distribution
- <65: 39, 65-74: 12, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Matt Zak, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Venlafaxine Hcl Er
Venlafaxine Hcl Er
34 claims
- Quetiapine Fumarate
Quetiapine Fumarate
29 claims
- Olanzapine
Olanzapine
27 claims
- Trazodone Hcl
Trazodone Hcl
26 claims
- Aripiprazole
Aripiprazole
25 claims
- Buspirone Hcl
Buspirone Hcl
24 claims
- Citalopram Hbr
Citalopram Hbr
24 claims
- Haloperidol
Haloperidol
22 claims
| Drug | Claims |
|---|---|
| Venlafaxine Hcl Er Venlafaxine Hcl | 34 |
| Quetiapine Fumarate | 29 |
| Olanzapine | 27 |
| Trazodone Hcl | 26 |
| Aripiprazole | 25 |
| Buspirone Hcl | 24 |
| Citalopram Hbr Citalopram Hydrobromide | 24 |
| Haloperidol | 22 |
| Hydroxyzine Hcl | 22 |
| Clonazepam | 21 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Psychiatry Physician Overview
How Matt Zak, M.D. fits within the Psychiatry Physician landscape nationally.
53,171
Psychiatry Physician Providers in US
56
States with Psychiatry Physician
1,038
Avg Claims per Provider
Matt Zak, M.D.'s 586 claims are below the specialty average of 1,038.
Nearby Psychiatry Physician Providers in Wisconsin
Other clinicians with the same primary specialty enrolled in Wisconsin, drawn from the same CMS NPPES roster as Zak.
Dr. Semhal Abbay
MD
Green Bay, WI
Dr. Beth Abramson
M.D.
Milwaukee, WI
Dr. Sean Ackerman
M.D.
Columbus, WI
Dr. Nagwa Agaiby
M.D.
Milwaukee, WI
Dr. Himanshu Agrawal
M.D.
Milwaukee, WI
Compare Psychiatry 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 Wisconsin medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Psychiatry 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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Frequently Asked Questions
What is Matt Zak, M.D.'s specialty? ▼
Matt Zak, M.D. specializes in Psychiatry Physician and practices in De Pere, Wisconsin. Credentials: M.D..
How much does Matt Zak, M.D. prescribe under Medicare Part D? ▼
In 2023, Matt Zak, M.D. wrote 586 Medicare Part D claims totaling $45K in drug costs for 55 beneficiaries.
What is Matt Zak, M.D.'s Medicare quality score? ▼
Matt Zak, M.D. has a CMS MIPS Final Score of 94.6/100 (Quality: 85.2). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Matt Zak, M.D. located? ▼
Matt Zak, M.D. is located at 3860 MONROE RD, De Pere, WI, 54115. Phone: (920) 496-4700.
What is Matt Zak, M.D.'s NPI number? ▼
Matt Zak, M.D.'s National Provider Identifier (NPI) is 1275621807, issued on 10/10/2006.
Does Matt Zak, M.D. prescribe more brand-name or generic drugs? ▼
Matt Zak, M.D.'s prescribing is 4% brand-name and 96% generic drugs by claim count, with $28K in brand drug costs.
How many Psychiatry Physician providers are there in the US? ▼
There are 53,171 Psychiatry Physician providers across 56 states in the US. The average Psychiatry Physician provider writes 1,038 Medicare Part D claims per year.
What drugs does Matt Zak, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Matt Zak, M.D.'s most frequently prescribed drugs include Venlafaxine Hcl Er, Quetiapine Fumarate, Olanzapine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Matt Zak, M.D. accept Medicare? ▼
Matt Zak, M.D. appears in CMS Medicare data with 586 Part D claims and 55 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Matt Zak, M.D.'s credentials? ▼
Matt Zak, M.D.'s NPI is 1275621807 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.