NPI registry status
Active
2026 NPPES data Maternal & Fetal Medicine Physician NPI 1982819058 M.D.
Verify on CMS → Ronald Cwik, M.D.
Maternal & Fetal Medicine Physician in Guilford, 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 2,112 in Maternal & Fetal Medicine 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
490
Medicare Part D claims · 125 beneficiaries · Maternal & Fetal Medicine Physician avg: 75
Generic prescribing
84%
generic claims · 16% brand-name · higher generic rates reduce patient out-of-pocket costs
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
Ronald Cwik, M.D. filed 490 Medicare Part D claims in 2023 as a Maternal & Fetal Medicine Physician in Guilford, Connecticut, prescribing 84% generic.
- 490
- Part D claims, 2023
- 84%
- 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.
Ronald Cwik, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
490 Top 38% higher than 62% 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-eligible specialty (heuristic, not verified)
Ronald Cwik, M.D. 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 Ronald Cwik, M.D.?
Quality data not reportedPrimary specialty
Maternal & Fetal Medicine Physician
Medicare Part D claims
490 7× vs specialty avg
Specialty distribution in Connecticut
How Maternal & Fetal Medicine 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 Maternal & Fetal Medicine 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).
Ronald Cwik, M.D. appears in the CMS NPPES registry as a Maternal & Fetal Medicine Physician provider holding M.D. credentials at 652 BOSTON POST RD, Guilford, CT, 06437, with a listed phone of (203) 453-5214. NPI 1982819058 was issued on 05/11/2007.
Medicare Part D records for calendar year 2023 show 490 prescription claims written by this provider, covering 125 Medicare beneficiaries and totaling roughly $48K in drug spend, split 16% brand-name and 84% generic by claim count.
Maternal & Fetal Medicine Physician is a narrow specialty nationwide, with 2,112 enrolled providers across 52 states and an average of 75 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 | 1982819058 |
|---|---|
| Specialty | Maternal & Fetal Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 05/11/2007 |
Brand vs generic prescribing mix · Typical
Ronald Cwik, M.D. - brand share 16.0%
Maternal & Fetal Medicine Physician average
16% brand-name claims vs 84% generic, on 490 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.
490
Total Claims
$48K
Total Drug Cost
125
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 994
- Total Day Supply
- 26,158
- Brand vs Generic
- 16% brand / 84% generic
- Brand Drug Cost
- $37K
- Generic Drug Cost
- $11K
- Antibiotic Claims
- 94
Patient Demographics
- Average Patient Age
- 72.3 years
- Avg HCC Risk Score
- 0.86
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Ronald Cwik, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Alendronate Sodium
Alendronate Sodium
77 claims
- Ciprofloxacin Hcl
Ciprofloxacin Hcl
44 claims
- Triamcinolone Acet…
Triamcinolone Acetonide
39 claims
- Metronidazole
Metronidazole
37 claims
- Alprazolam 29
Alprazolam
29 claims
- Estradiol 26
Estradiol
26 claims
- Myrbetriq 22
Myrbetriq
22 claims
- Fluconazole 21
Fluconazole
21 claims
| Drug | Claims |
|---|---|
| Alendronate Sodium | 77 |
| Ciprofloxacin Hcl | 44 |
| Triamcinolone Acetonide | 39 |
| Metronidazole | 37 |
| Alprazolam | 29 |
| Estradiol | 26 |
| Myrbetriq Mirabegron | 22 |
| Fluconazole | 21 |
| Levothyroxine Sodium | 20 |
| Raloxifene Hcl | 16 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Maternal & Fetal Medicine Physician in CT →
All providers in Connecticut →
Compare specialties →
Maternal & Fetal Medicine Physician Overview
How Ronald Cwik, M.D. fits within the Maternal & Fetal Medicine Physician landscape nationally.
2,112
Maternal & Fetal Medicine Physician Providers in US
52
States with Maternal & Fetal Medicine Physician
75
Avg Claims per Provider
Ronald Cwik, M.D.'s 490 claims are above the specialty average of 75.
Nearby Maternal & Fetal Medicine Physician Providers in Connecticut
Other clinicians with the same primary specialty enrolled in Connecticut, drawn from the same CMS NPPES roster as Cwik.
Dr. Jonathan Barnhard
MD
Norwalk, CT
Dr. Courtney Birchall
MD
Hartford, CT
Dr. Whitney Booker
MD
Stamford, CT
Dr. Adam Borgida
M.D.
Hartford, CT
Dr. Katherine Campbell
M.D.
New Haven, CT
Compare Maternal & Fetal Medicine 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 Connecticut medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Maternal & Fetal Medicine 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 Ronald Cwik, M.D.'s specialty? ▼
Ronald Cwik, M.D. specializes in Maternal & Fetal Medicine Physician and practices in Guilford, Connecticut. Credentials: M.D..
How much does Ronald Cwik, M.D. prescribe under Medicare Part D? ▼
In 2023, Ronald Cwik, M.D. wrote 490 Medicare Part D claims totaling $48K in drug costs for 125 beneficiaries.
Where is Ronald Cwik, M.D. located? ▼
Ronald Cwik, M.D. is located at 652 BOSTON POST RD, Guilford, CT, 06437. Phone: (203) 453-5214.
What is Ronald Cwik, M.D.'s NPI number? ▼
Ronald Cwik, M.D.'s National Provider Identifier (NPI) is 1982819058, issued on 05/11/2007.
Does Ronald Cwik, M.D. prescribe more brand-name or generic drugs? ▼
Ronald Cwik, M.D.'s prescribing is 16% brand-name and 84% generic drugs by claim count, with $37K in brand drug costs.
How many Maternal & Fetal Medicine Physician providers are there in the US? ▼
There are 2,112 Maternal & Fetal Medicine Physician providers across 52 states in the US. The average Maternal & Fetal Medicine Physician provider writes 75 Medicare Part D claims per year.
What drugs does Ronald Cwik, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Ronald Cwik, M.D.'s most frequently prescribed drugs include Alendronate Sodium, Ciprofloxacin Hcl, Triamcinolone Acetonide. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ronald Cwik, M.D. accept Medicare? ▼
Ronald Cwik, M.D. appears in CMS Medicare data with 490 Part D claims and 125 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ronald Cwik, M.D.'s credentials? ▼
Ronald Cwik, M.D.'s NPI is 1982819058 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.