NPI registry status
Active
2026 NPPES data Obstetrics & Gynecology Physician NPI 1508445461 MD
Verify on CMS → Leigh Kowalski, MD
Obstetrics & Gynecology Physician in Hartford, Connecticut.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 44,326 in Obstetrics & Gynecology 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
52
Medicare Part D claims · 29 beneficiaries · Obstetrics & Gynecology Physician avg: 179
What the federal data shows
Leigh Kowalski, MD filed 52 Medicare Part D claims in 2023 as an Obstetrics & Gynecology Physician in Hartford, Connecticut.
- 52
- Part D claims, 2023
- Likely
- board-certified (heuristic)
- ≥0th
- 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.
CMS NPPES provider registry desk
NPI 1508445461 · Obstetrics & Gynecology Physician
NPI-10 · ENUM-RECENT · TAX-MID · RX-TRACE · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1508445461
- ENUM-RECENT 2021
- TAX-MID 44K Obstetrics &
- RX-TRACE 52
- BOOK-LIGHT 671 in Connecticut
- PHOTO-ENUM Katherine Panushka · 2021
Leigh Kowalski, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
52 ≥ 0th percentile 0% of 1,370,886 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 · 2023
✓
Board certification likely (heuristic, not verified)
Leigh Kowalski, MD 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 Leigh Kowalski, MD?
Quality data not reportedPrimary specialty
Obstetrics & Gynecology Physician
Medicare Part D claims
52 71% vs specialty avg
Specialty distribution in Connecticut
How Obstetrics & Gynecology Physician compares to other specialties among Connecticut 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 Obstetrics & Gynecology 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 | 1508445461 |
|---|---|
| Specialty | Obstetrics & Gynecology Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 04/06/2021 |
Hospital and facility affiliations
Facilities where Leigh Kowalski, MD 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.
Physicians For Women's Health, LLC
Hartford, CT
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
52
Total Claims
$707
Total Drug Cost
29
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 64
- Total Day Supply
- 1,072
- Generic Drug Cost
- $490
- Opioid Claims
- 16 (30.8% rate)
Patient Demographics
- Average Patient Age
- 68.8 years
- Avg HCC Risk Score
- 1.21
- Gender Split
- 100% female / 0% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Ibuprofen | 18 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Obstetrics & Gynecology Physician Overview
How Leigh Kowalski, MD fits within the Obstetrics & Gynecology Physician landscape nationally.
44,326
Obstetrics & Gynecology Physician Providers in US
56
States with Obstetrics & Gynecology Physician
179
Avg Claims per Provider
Leigh Kowalski, MD's 52 claims are below the specialty average of 179.
Nationwide Obstetrics & Gynecology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Kowalski, both outside Connecticut so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2021)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Obstetrics & Gynecology Physician Providers in Connecticut
Other clinicians with the same primary specialty enrolled in Connecticut, drawn from the same CMS NPPES roster as Kowalski.
One of 671 Obstetrics & Gynecology Physician providers enrolled in Connecticut, 5 are shown here.
Dr. Anne Abbate
MD
Bridgeport, CT
Dr. Sonya Abdel-Razeq
MD
New Haven, CT
Dr. Roxanne Abder
MD
Trumbull, CT
Dr. Patricia Abruna
M.D.
Fairfield, CT
Dr. Ami Acharya
M.D.
Hamden, CT
Compare Obstetrics & Gynecology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Leigh Kowalski, MD's specialty? ▼
Leigh Kowalski, MD specializes in Obstetrics & Gynecology Physician and practices in Hartford, Connecticut. Credentials: MD.
How much does Leigh Kowalski, MD prescribe under Medicare Part D? ▼
In 2023, Leigh Kowalski, MD wrote 52 Medicare Part D claims totaling $707 in drug costs for 29 beneficiaries.
Where is Leigh Kowalski, MD located? ▼
Leigh Kowalski, MD is located at 100 RETREAT AVE STE 201, Hartford, CT, 06106. Phone: (860) 246-8568.
What is Leigh Kowalski, MD's NPI number? ▼
Leigh Kowalski, MD's National Provider Identifier (NPI) is 1508445461, issued on 04/06/2021.
Does Leigh Kowalski, MD prescribe opioids? ▼
Yes, Leigh Kowalski, MD had 16 opioid claims in 2023 with an opioid prescribing rate of 30.8%.
How many Obstetrics & Gynecology Physician providers are there in the US? ▼
There are 44,326 Obstetrics & Gynecology Physician providers across 56 states in the US. The average Obstetrics & Gynecology Physician provider writes 179 Medicare Part D claims per year.
What drugs does Leigh Kowalski, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Leigh Kowalski, MD's most frequently prescribed drugs include Ibuprofen. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Leigh Kowalski, MD accept Medicare? ▼
Leigh Kowalski, MD appears in CMS Medicare data with 52 Part D claims and 29 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Leigh Kowalski, MD's credentials? ▼
Leigh Kowalski, MD's NPI is 1508445461 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
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
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.