NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1043206873 M.D.
Verify on CMS → Lester Bowser, M.D.
Gastroenterology Physician in Baltimore, Maryland.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 17,061 in Gastroenterology 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
384
Medicare Part D claims · 137 beneficiaries · Gastroenterology Physician avg: 848
Generic prescribing
85%
generic claims · 15% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
80.2/100
▼ 3 pts below national avg 83.5 · Above neutral
Industry payments
$118.01
4 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Lester Bowser, M.D. reported a CMS MIPS final score of 80.2/100 - below the 83.5 national average - and filed 384 Medicare Part D claims in 2024.
- 80.2/100
- MIPS score · -3 vs avg
- 384
- Part D claims, 2024
- 85%
- 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.
Federal trust snapshot
What official records show about Lester Bowser, M.D.
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1043206873), first enumerated 09/27/2005.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 384 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
Reported a CMS MIPS final score of 80.2/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- 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
$118.01 in reported industry payments (4 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 1043206873 · Gastroenterology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · MIPS-BELOW · RX-LIGHT · BOOK-THIN · PHOTO-FINISH
- NPI-10 1043206873
- ENUM-LEGACY 2005
- TAX-MID 17K Gastroenterology Physician
- MIPS-BELOW 80.2/100
- RX-LIGHT 384
- BOOK-THIN 424 in Maryland
- PHOTO-FINISH Jasmine Barrow · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Bowser · this pr…
Bowser · this provider
80.2 MIPS pts
- Victor Ciofoaia …
Victor Ciofoaia
80.2 MIPS pts
- Jasmine Barrow ·…
Jasmine Barrow
80.2 MIPS pts
- John Carroll · n…
John Carroll
80.2 MIPS pts
- Walid Chalhoub ·…
Walid Chalhoub
80.2 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Lester Bowser, M.D.'s MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
80 ≥ 30th percentile 30% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured 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.
The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Lester Bowser, M.D. sits
This provider among gastroenterology physician peers
Across the 5,560 gastroenterology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Lester Bowser, M.D. writes more Part D claims than 27% of them and scores higher on MIPS quality than 33% - placing this provider in the lower-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one gastroenterology physician peer from a representative sample of 60; the gold marker is Lester Bowser, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Lester Bowser, M.D. 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 Lester Bowser, M.D.?
Near national averagePrimary specialty
Gastroenterology Physician
Medicare Part D claims
384 55% vs specialty avg
MIPS final score
80.2/100 3.3 pts vs avg
Specialty distribution in Maryland
How Gastroenterology Physician compares to other specialties among Maryland providers
Medicare quality performance, MIPS
Lester Bowser, M.D.'s 2023 MIPS final score plotted against the Gastroenterology Physician national average
- MIPS Final Score
- 80.2/100
- vs 83.5 national avg · 2023 performance year
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 | 1043206873 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 09/27/2005 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
80.1797
Final Score
Measured-score avg: 83.5
76.6904
Quality
53.4937
Cost
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Lester Bowser, M.D. 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.
Medstar Medical Group II LLC
Baltimore, MD
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 Lester Bowser, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$118
Largest payer
ABBVIE 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
Lester Bowser, M.D. - brand share 15.0%
Gastroenterology Physician average
15% brand-name claims vs 85% generic, on 384 2024 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 2024.
384
Total Claims
$91K
Total Drug Cost
137
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 783.167
- Total Day Supply
- 22,227
- Brand vs Generic
- 15% brand / 85% generic
- Brand Drug Cost
- $80K
- Generic Drug Cost
- $11K
- Antibiotic Claims
- 26
Patient Demographics
- Average Patient Age
- 69.4 years
- Avg HCC Risk Score
- 1.64
- Gender Split
- 66% female / 34% male
- Age Distribution
- <65: 35, 65-74: 58, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Lester Bowser, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Pantoprazole Sodium
Pantoprazole Sodium
105 claims
- Famotidine
Famotidine
83 claims
- Omeprazole 24
Omeprazole
24 claims
- Esomeprazole Magne… 19
Esomeprazole Magnesium
19 claims
- Lubiprostone 19
Lubiprostone
19 claims
- Creon 18
Creon
18 claims
- Zenpep 11
Zenpep
11 claims
| Drug | Claims |
|---|---|
| Pantoprazole Sodium | 105 |
| Famotidine | 83 |
| Omeprazole | 24 |
| Esomeprazole Magnesium | 19 |
| Lubiprostone | 19 |
| Creon Lipase/Protease/Amylase | 18 |
| Zenpep Lipase/Protease/Amylase | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How Lester Bowser, M.D. fits within the Gastroenterology Physician landscape nationally.
17,061
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
848
Avg Claims per Provider
Lester Bowser, M.D.'s 384 claims are below the specialty average of 848.
Nationwide Gastroenterology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Bowser, both outside Maryland so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (80.2 here).
Same NPPES enumeration year (2005)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Gastroenterology Physician Providers in Maryland
Other clinicians with the same primary specialty enrolled in Maryland, drawn from the same CMS NPPES roster as Bowser.
One of 424 Gastroenterology Physician providers enrolled in Maryland, 5 are shown here.
Dr. Maaza Abdi
M.D.
Baltimore, MD
Dr. Tsion Abdi
MD
Baltimore, MD
Dr. Hamza Abdulla
M.D.
Easton, MD
Dr. Thomas Abernathy
M.D.
Catonsville, MD
Dr. Ruben Acosta
M.D.
Silver Spring, MD
Compare Gastroenterology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Lester Bowser, M.D.'s specialty? ▼
Lester Bowser, M.D. specializes in Gastroenterology Physician and practices in Baltimore, Maryland. Credentials: M.D..
How much does Lester Bowser, M.D. prescribe under Medicare Part D? ▼
In 2024, Lester Bowser, M.D. wrote 384 Medicare Part D claims totaling $91K in drug costs for 137 beneficiaries.
What is Lester Bowser, M.D.'s Medicare quality score? ▼
Lester Bowser, M.D. has a CMS MIPS Final Score of 80.2/100 (Quality: 76.7, Cost: 53.5). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Lester Bowser, M.D. located? ▼
Lester Bowser, M.D. is located at 1838 GREENE TREE RD, Baltimore, MD, 21208. Phone: (410) 602-7782.
What is Lester Bowser, M.D.'s NPI number? ▼
Lester Bowser, M.D.'s National Provider Identifier (NPI) is 1043206873, issued on 09/27/2005.
Does Lester Bowser, M.D. prescribe more brand-name or generic drugs? ▼
Lester Bowser, M.D.'s prescribing is 15% brand-name and 85% generic drugs by claim count, with $80K in brand drug costs.
How many Gastroenterology Physician providers are there in the US? ▼
There are 17,061 Gastroenterology Physician providers across 54 states in the US. The average Gastroenterology Physician provider writes 848 Medicare Part D claims per year.
What drugs does Lester Bowser, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Lester Bowser, M.D.'s most frequently prescribed drugs include Pantoprazole Sodium, Famotidine, Omeprazole. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Lester Bowser, M.D. accept Medicare? ▼
Lester Bowser, M.D. appears in CMS Medicare data with 384 Part D claims and 137 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Lester Bowser, M.D.'s credentials? ▼
Lester Bowser, M.D.'s NPI is 1043206873 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 (2024). 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 August 2026 (NPPES) / 2024 (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 August 2026.