2026 NPPES data Emergency Medicine Physician NPI 1619959145 DO
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GREGORY ZOLKOWSKI, DO

Emergency Medicine Physician in BOLIVAR, Missouri. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
450
Medicare Part D claims · 202 beneficiaries · Emergency Medicine Physician avg: 352
Generic prescribing
97%
generic claims · 3% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
92.4311/100
▲ 9 pts above national avg 83.1 · [object Object]

What the federal data shows

GREGORY ZOLKOWSKI, DO reported a CMS MIPS final score of 92.4311/100 — above the 83.1 national average — and filed 450 Medicare Part D claims in 2023.

92.4311/100
MIPS score · +9 vs avg
450
Part D claims, 2023
97%
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.

GREGORY ZOLKOWSKI, DO's MIPS score vs every scored U.S. clinician

CMS Merit-based Incentive Payment System (MIPS) final score, 2023 — the federal quality measure

92 Top 32% higher than 68% of 477,587 scored providers

0–10: 8,684 scored providers (2%). Below this entry. 10–20: 3,008 scored providers (1%). Below this entry. 20–30: 3,069 scored providers (1%). Below this entry. 30–40: 2,746 scored providers (1%). Below this entry. 40–50: 2,928 scored providers (1%). Below this entry. 50–60: 5,882 scored providers (1%). Below this entry. 60–70: 13,906 scored providers (3%). Below this entry. 70–80: 118,074 scored providers (25%). Below this entry. 80–90: 129,887 scored providers (27%). Below this entry. 90–100: 189,403 scored providers (40%). This entry sits in this band. This provider 0 100 every MIPS-scored clinician, bucketed by value

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

Board certification likely (heuristic — not verified)

GREGORY ZOLKOWSKI, DO practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 GREGORY ZOLKOWSKI, DO?

High performer (top quartile)

NPI registry status

Active

Issued 11/18/2005

NPI 1619959145

Primary specialty

Emergency Medicine Physician

High-volume

64,398 US NPIs in this specialty

Medicare Part D claims

450 28% vs specialty avg

2023 prescription claims

Specialty avg: 352

MIPS final score

92.4311/100 9.331100000000006% pts

Exceptional band

vs 83.1 national avg

Specialty distribution in Missouri

How Emergency Medicine Physician compares to other specialties among Missouri providers

Missouri providers

Emergency Medicine Physician share within Missouri

1. Emergency Medicine Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Emergency Medicine Physician share within Missouri

Medicare quality performance — MIPS

GREGORY ZOLKOWSKI, DO's 2023 MIPS final score plotted against the Emergency Medicine Physician national average

High performer (top quartile)
MIPS Final Score
92.4311/100
vs 83.1 national avg · 2023 performance year

MIPS final score (Emergency Medicine Physician) — 92.4311/100 vs national avg 83.1

0%100%National avg83%92.4%
MIPS final score (Emergency Medicine Physician) — 92.4311/100 vs national avg 83.1

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).

GREGORY ZOLKOWSKI, DO appears in the CMS NPPES registry as a Emergency Medicine Physician provider holding DO credentials at 910 E SAN MARTIN ST, BOLIVAR, MO, 65613, with a listed phone of (417) 777-4749. NPI 1619959145 was issued on 11/18/2005. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what ZOLKOWSKI most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 450 prescription claims written by this provider, covering 202 Medicare beneficiaries and totaling roughly $10K in drug spend, split 3% brand-name and 97% generic by claim count, with an opioid prescribing rate of 5.3%. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 92.4311/100 for the 2023 performance year (Quality 68.4745), compared with the national average of 83.1.

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

910 E SAN MARTIN ST
BOLIVAR, MO 65613

Provider Details

NPI 1619959145
Specialty Emergency Medicine Physician
Credentials DO
Gender Male
NPI Issued 11/18/2005

CMS Quality Score (MIPS)

Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.

92.4311
Final Score
Avg: 83.1
68.4745
Quality

Reporting: Group practice

Hospital and facility affiliations

Facilities where GREGORY ZOLKOWSKI, 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.

POTOSI EMERGENCY GROUP, LLC
POTOSI, MO

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

GREGORY ZOLKOWSKI, DO — brand share 3.0%
Specialty average (est.)

3% brand-name claims vs 97% generic, on 450 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.

450
Total Claims
$10K
Total Drug Cost
202
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
456
Total Day Supply
5,658
Brand vs Generic
3% brand / 97% generic
Brand Drug Cost
$3K
Generic Drug Cost
$7K
Opioid Claims
24 (5.3% rate)
Antibiotic Claims
105

Patient Demographics

Average Patient Age
64.1 years
Avg HCC Risk Score
2.20
Gender Split
60% female / 40% male
Age Distribution
<65: 96, 65-74: 63, 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 GREGORY ZOLKOWSKI, DO prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Meloxicam
59
Cephalexin
40
Prednisone
24
Sulfamethoxazole-Trimethoprim
Sulfamethoxazole/Trimethoprim
21
Dicyclomine Hcl
20
Methylprednisolone
19
Citalopram Hbr
Citalopram Hydrobromide
18
Lactulose
14
Oxycodone-Acetaminophen
Oxycodone Hcl/Acetaminophen
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 GREGORY ZOLKOWSKI, DO 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

GREGORY ZOLKOWSKI, DO's 450 claims are above the specialty average of 352.

Nearby Emergency Medicine Physician Providers in Missouri

Other clinicians with the same primary specialty enrolled in Missouri, drawn from the same CMS NPPES roster as ZOLKOWSKI.

Compare Emergency Medicine Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is GREGORY ZOLKOWSKI, DO's specialty?
GREGORY ZOLKOWSKI, DO specializes in Emergency Medicine Physician and practices in BOLIVAR, Missouri. Credentials: DO.
How much does GREGORY ZOLKOWSKI, DO prescribe under Medicare Part D?
In 2023, GREGORY ZOLKOWSKI, DO wrote 450 Medicare Part D claims totaling $10K in drug costs for 202 beneficiaries.
What is GREGORY ZOLKOWSKI, DO's Medicare quality score?
GREGORY ZOLKOWSKI, DO has a CMS MIPS Final Score of 92.4311/100 (Quality: 68.4745). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is GREGORY ZOLKOWSKI, DO located?
GREGORY ZOLKOWSKI, DO is located at 910 E SAN MARTIN ST, BOLIVAR, MO, 65613. Phone: (417) 777-4749.
What is GREGORY ZOLKOWSKI, DO's NPI number?
GREGORY ZOLKOWSKI, DO's National Provider Identifier (NPI) is 1619959145, issued on 11/18/2005.
Does GREGORY ZOLKOWSKI, DO prescribe more brand-name or generic drugs?
GREGORY ZOLKOWSKI, DO's prescribing is 3% brand-name and 97% generic drugs by claim count, with $3K in brand drug costs.
Does GREGORY ZOLKOWSKI, DO prescribe opioids?
Yes, GREGORY ZOLKOWSKI, DO had 24 opioid claims in 2023 with an opioid prescribing rate of 5.3%.
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.
What drugs does GREGORY ZOLKOWSKI, DO prescribe most often?
Based on 2023 Medicare Part D data, GREGORY ZOLKOWSKI, DO's most frequently prescribed drugs include Meloxicam, Cephalexin, Prednisone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does GREGORY ZOLKOWSKI, DO accept Medicare?
GREGORY ZOLKOWSKI, DO appears in CMS Medicare data with 450 Part D claims and 202 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify GREGORY ZOLKOWSKI, DO's credentials?
GREGORY ZOLKOWSKI, DO's NPI is 1619959145 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

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