2026 NPPES data Emergency Medicine Physician NPI 1639217821 MD
Verify on CMS →

MICHAEL MASIOWSKI, MD

Emergency Medicine Physician in SUMMERVILLE, South Carolina. 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
240
Medicare Part D claims · 136 beneficiaries · Emergency Medicine Physician avg: 352
Generic prescribing
90%
generic claims · 10% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

MICHAEL MASIOWSKI, MD filed 240 Medicare Part D claims in 2023 as a Emergency Medicine Physician in SUMMERVILLE, South Carolina, prescribing 90% generic.

240
Part D claims, 2023
90%
generic prescribing

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.

MICHAEL MASIOWSKI, MD's Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023 — across all CMS prescribers nationally

240 49th percentile higher than 49% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). Below this entry. 200–400: 182,923 prescribers (13%). This entry sits in this band. 400–600: 90,619 prescribers (7%). Above this entry. 600–800: 56,224 prescribers (4%). Above this entry. 800–1,000: 40,919 prescribers (3%). Above this entry. 1,000–1,200: 31,827 prescribers (2%). Above this entry. 1,200–1,400: 26,224 prescribers (2%). Above this entry. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2,000–2,200: 213,991 prescribers (16%). Above this entry. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

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-eligible specialty (heuristic — not verified)

MICHAEL MASIOWSKI, MD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).

What does the federal data show about MICHAEL MASIOWSKI, MD?

Quality data not reported

NPI registry status

Active

Issued 02/01/2007

NPI 1639217821

Primary specialty

Emergency Medicine Physician

High-volume

64,398 US NPIs in this specialty

Medicare Part D claims

240 32% vs specialty avg

2023 prescription claims

Specialty avg: 352

Specialty distribution in South Carolina

How Emergency Medicine Physician compares to other specialties among South Carolina providers

South Carolina providers

Emergency Medicine Physician share within South Carolina

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

Specialty board-certification context

Estimated specialty board-certified rate — Emergency Medicine Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Emergency Medicine Physician ABMS/AOA estimate

Est. board-certified rate (Emergency Medicine Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Emergency Medicine Physician) — ABMS / AOA estimate

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).

MICHAEL MASIOWSKI, MD appears in the CMS NPPES registry as a Emergency Medicine Physician provider holding MD credentials at 295 MIDLAND PKWY, SUMMERVILLE, SC, 29485, with a listed phone of (843) 832-5000. NPI 1639217821 was issued on 02/01/2007. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what MASIOWSKI 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 240 prescription claims written by this provider, covering 136 Medicare beneficiaries and totaling roughly $8K in drug spend, split 10% brand-name and 90% generic by claim count, with an opioid prescribing rate of 11.7%. 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.

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

295 MIDLAND PKWY
SUMMERVILLE, SC 29485

Provider Details

NPI 1639217821
Specialty Emergency Medicine Physician
Credentials MD
Gender Male
NPI Issued 02/01/2007

Brand vs generic prescribing mix · Typical

MICHAEL MASIOWSKI, MD — brand share 10.0%
Specialty average (est.)

10% brand-name claims vs 90% generic, on 240 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.

240
Total Claims
$8K
Total Drug Cost
136
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
256
Total Day Supply
4,059
Brand vs Generic
10% brand / 90% generic
Brand Drug Cost
$4K
Generic Drug Cost
$4K
Opioid Claims
28 (11.7% rate)
Antibiotic Claims
57

Patient Demographics

Average Patient Age
70.9 years
Avg HCC Risk Score
1.78
Gender Split
60% female / 40% male
Age Distribution
<65: 32, 65-74: 54, 75-84: 32, 85+: 18

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

What MICHAEL MASIOWSKI, MD 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
Hydrocodone-Acetaminophen
Hydrocodone/Acetaminophen
26
Cefdinir
25
Diclofenac Sodium
16
Celecoxib
13
Prednisone
13
Amoxicillin-Clavulanate Potass
Amoxicillin/Potassium Clav
12
Desmopressin Acetate
11

* 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 MICHAEL MASIOWSKI, MD 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

MICHAEL MASIOWSKI, MD's 240 claims are below the specialty average of 352.

Nearby Emergency Medicine Physician Providers in South Carolina

Other clinicians with the same primary specialty enrolled in South Carolina, drawn from the same CMS NPPES roster as MASIOWSKI.

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

Frequently Asked Questions

What is MICHAEL MASIOWSKI, MD's specialty?
MICHAEL MASIOWSKI, MD specializes in Emergency Medicine Physician and practices in SUMMERVILLE, South Carolina. Credentials: MD.
How much does MICHAEL MASIOWSKI, MD prescribe under Medicare Part D?
In 2023, MICHAEL MASIOWSKI, MD wrote 240 Medicare Part D claims totaling $8K in drug costs for 136 beneficiaries.
Where is MICHAEL MASIOWSKI, MD located?
MICHAEL MASIOWSKI, MD is located at 295 MIDLAND PKWY, SUMMERVILLE, SC, 29485. Phone: (843) 832-5000.
What is MICHAEL MASIOWSKI, MD's NPI number?
MICHAEL MASIOWSKI, MD's National Provider Identifier (NPI) is 1639217821, issued on 02/01/2007.
Does MICHAEL MASIOWSKI, MD prescribe more brand-name or generic drugs?
MICHAEL MASIOWSKI, MD's prescribing is 10% brand-name and 90% generic drugs by claim count, with $4K in brand drug costs.
Does MICHAEL MASIOWSKI, MD prescribe opioids?
Yes, MICHAEL MASIOWSKI, MD had 28 opioid claims in 2023 with an opioid prescribing rate of 11.7%.
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 MICHAEL MASIOWSKI, MD prescribe most often?
Based on 2023 Medicare Part D data, MICHAEL MASIOWSKI, MD's most frequently prescribed drugs include Hydrocodone-Acetaminophen, Cefdinir, Diclofenac Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does MICHAEL MASIOWSKI, MD accept Medicare?
MICHAEL MASIOWSKI, MD appears in CMS Medicare data with 240 Part D claims and 136 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify MICHAEL MASIOWSKI, MD's credentials?
MICHAEL MASIOWSKI, MD's NPI is 1639217821 with credentials MD. 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.
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