NPI registry status
Active
2026 NPPES data Obstetrics & Gynecology Physician NPI 1588695043 MD
Verify on CMS → Barbara Koewler, MD
Obstetrics & Gynecology Physician in Danville, Indiana.
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
244
Medicare Part D claims · 67 beneficiaries · Obstetrics & Gynecology Physician avg: 179
Generic prescribing
78%
generic claims · 22% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$404.22
18 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Barbara Koewler, MD filed 244 Medicare Part D claims in 2023 as an Obstetrics & Gynecology Physician in Danville, Indiana, prescribing 78% generic.
- 244
- Part D claims, 2023
- 78%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥49th
- 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.
Federal trust snapshot
What official records show about Barbara Koewler, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1588695043), first enumerated 07/05/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 244 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$404.22 in reported industry payments (18 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1588695043 · Obstetrics & Gynecology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1588695043
- ENUM-LEGACY 2006
- TAX-MID 44K Obstetrics &
- RX-LIGHT 244
- BOOK-LIGHT 835 in Indiana
- PHOTO-ENUM Christina Chao · 2006
Barbara Koewler, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
244 ≥ 49th percentile 49% 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)
Barbara Koewler, 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 Barbara Koewler, MD?
Quality data not reportedPrimary specialty
Obstetrics & Gynecology Physician
Medicare Part D claims
244 36% vs specialty avg
Specialty distribution in Indiana
How Obstetrics & Gynecology Physician compares to other specialties among Indiana 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 | 1588695043 |
|---|---|
| Specialty | Obstetrics & Gynecology Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 07/05/2006 |
Hospital and facility affiliations
Facilities where Barbara Koewler, 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.
Hendricks County Hospital
Danville, IN
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Barbara Koewler, MD. Source: openpaymentsdata.cms.gov.
Total received
$404
Largest payer
Sumitomo Pharma America, Inc.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Brand vs generic prescribing mix · Typical
Barbara Koewler, MD - brand share 22.0%
Obstetrics & Gynecology Physician average
22% brand-name claims vs 78% generic, on 244 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.
244
Total Claims
$42K
Total Drug Cost
67
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 567
- Total Day Supply
- 16,394
- Brand vs Generic
- 22% brand / 78% generic
- Brand Drug Cost
- $31K
- Generic Drug Cost
- $11K
- Antibiotic Claims
- 16
Patient Demographics
- Average Patient Age
- 68.5 years
- Avg HCC Risk Score
- 0.77
- 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.
What Barbara Koewler, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Estradiol
Estradiol
41 claims
- Osphena 14
Osphena
14 claims
- Zolpidem Tartrate 11
Zolpidem Tartrate
11 claims
| Drug | Claims |
|---|---|
| Estradiol | 41 |
| Osphena Ospemifene | 14 |
| Zolpidem Tartrate | 11 |
| Premarin "Estrogens | N/A |
* 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 Barbara Koewler, 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
Barbara Koewler, MD's 244 claims are above the specialty average of 179.
Nationwide Obstetrics & Gynecology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Koewler, both outside Indiana so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Obstetrics & Gynecology Physician Providers in Indiana
Other clinicians with the same primary specialty enrolled in Indiana, drawn from the same CMS NPPES roster as Koewler.
One of 835 Obstetrics & Gynecology Physician providers enrolled in Indiana, 5 are shown here.
Dr. Magdy Abdel Nour
M.D.
Terre Haute, IN
Omar Abuzeid
Crown Point, IN
Dr. Regina Adair-Blackwell
MD
Fort Wayne, IN
Dr. Kristin Adams
MD
Indianapolis, IN
Dr. Sophia Addy
MD
Merrillville, IN
Compare Obstetrics & Gynecology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Barbara Koewler, MD's specialty? ▼
Barbara Koewler, MD specializes in Obstetrics & Gynecology Physician and practices in Danville, Indiana. Credentials: MD.
How much does Barbara Koewler, MD prescribe under Medicare Part D? ▼
In 2023, Barbara Koewler, MD wrote 244 Medicare Part D claims totaling $42K in drug costs for 67 beneficiaries.
Where is Barbara Koewler, MD located? ▼
Barbara Koewler, MD is located at 112 HOSPITAL LANE, Danville, IN, 46122. Phone: (317) 745-3366.
What is Barbara Koewler, MD's NPI number? ▼
Barbara Koewler, MD's National Provider Identifier (NPI) is 1588695043, issued on 07/05/2006.
Does Barbara Koewler, MD prescribe more brand-name or generic drugs? ▼
Barbara Koewler, MD's prescribing is 22% brand-name and 78% generic drugs by claim count, with $31K in brand drug costs.
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 Barbara Koewler, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Barbara Koewler, MD's most frequently prescribed drugs include Estradiol, Osphena, Zolpidem Tartrate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Barbara Koewler, MD accept Medicare? ▼
Barbara Koewler, MD appears in CMS Medicare data with 244 Part D claims and 67 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Barbara Koewler, MD's credentials? ▼
Barbara Koewler, MD's NPI is 1588695043 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.