NPI registry status
Active
2026 NPPES data Ophthalmology Physician NPI 1710033022 MD
Verify on CMS → John Gambrill, MD
Ophthalmology Physician in Catonsville, 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 22,082 in Ophthalmology 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
875
Medicare Part D claims · 191 beneficiaries · Ophthalmology Physician avg: 1K
Generic prescribing
69%
generic claims · 31% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
78.5/100
▼ 5 pts below national avg 83.1 · Above neutral
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
John Gambrill, MD reported a CMS MIPS final score of 78.5/100 - below the 83.1 national average - and filed 875 Medicare Part D claims in 2023.
- 78.5/100
- MIPS score · -5 vs avg
- 875
- Part D claims, 2023
- 69%
- 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.
John Gambrill, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
79 27th percentile higher than 27% of 477,587 scored providers
Each bar is a band; taller bars hold more scored 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.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where John Gambrill, MD sits
This provider among ophthalmology physician peers
Across the 9,866 ophthalmology physician providers who report both Medicare Part D prescribing and a MIPS quality score, John Gambrill, MD writes more Part D claims than 40% 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.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one ophthalmology physician peer from a representative sample of 60; the gold marker is John Gambrill, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
John Gambrill, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 John Gambrill, MD?
Near national averagePrimary specialty
Ophthalmology Physician
Medicare Part D claims
875 38% vs specialty avg
MIPS final score
78.5/100 4.6 pts vs avg
Specialty distribution in Maryland
How Ophthalmology Physician compares to other specialties among Maryland providers
Medicare quality performance, MIPS
John Gambrill, MD's 2023 MIPS final score plotted against the Ophthalmology Physician national average
- MIPS Final Score
- 78.5/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Ophthalmology Physician) - 78.5/100 vs national avg 83.1
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).
John Gambrill, MD appears in the CMS NPPES registry as an Ophthalmology Physician provider holding MD credentials at 715 MAIDEN CHOICE LN, Catonsville, MD, 21228, with a listed phone of (410) 247-5602. NPI 1710033022 was issued on 01/27/2007.
Medicare Part D records for calendar year 2023 show 875 prescription claims written by this provider, covering 191 Medicare beneficiaries and totaling roughly $135K in drug spend, split 31% brand-name and 69% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 78.5/100 for the 2023 performance year (Quality 80.4, Cost 64.7), compared with the national average of 83.1.
Ophthalmology Physician is a mid-sized specialty nationwide, with 22,082 enrolled providers across 56 states and an average of 1,420 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 | 1710033022 |
|---|---|
| Specialty | Ophthalmology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 01/27/2007 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
78.5282
Final Score
Avg: 83.1
80.3613
Quality
64.7328
Cost
80
Promoting Interoperability
Reporting: Group practice
Brand vs generic prescribing mix · Above average
John Gambrill, MD - brand share 31.0%
Ophthalmology Physician average
31% brand-name claims vs 69% generic, on 875 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.
875
Total Claims
$135K
Total Drug Cost
191
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 2,044
- Total Day Supply
- 60,435
- Brand vs Generic
- 31% brand / 69% generic
- Brand Drug Cost
- $103K
- Generic Drug Cost
- $32K
Patient Demographics
- Average Patient Age
- 78.0 years
- Avg HCC Risk Score
- 1.23
- Gender Split
- 70% female / 30% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What John Gambrill, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Latanoprost
Latanoprost
313 claims
- Dorzolamide-Timolol
Dorzolamide-Timolol
150 claims
- Timolol Maleate 80
Timolol Maleate
80 claims
- Brimonidine Tartrate 61
Brimonidine Tartrate
61 claims
- Lumigan 57
Lumigan
57 claims
- Travoprost 34
Travoprost
34 claims
- Dorzolamide Hcl 32
Dorzolamide Hcl
32 claims
- Restasis 17
Restasis
17 claims
| Drug | Claims |
|---|---|
| Latanoprost | 313 |
| Dorzolamide-Timolol Dorzolamide Hcl/Timolol Maleat | 150 |
| Timolol Maleate | 80 |
| Brimonidine Tartrate | 61 |
| Lumigan Bimatoprost | 57 |
| Travoprost | 34 |
| Dorzolamide Hcl | 32 |
| Restasis Cyclosporine | 17 |
| Prednisolone Acetate | 12 |
| Rocklatan Netarsudil Mesylat/Latanoprost | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Ophthalmology Physician Overview
How John Gambrill, MD fits within the Ophthalmology Physician landscape nationally.
22,082
Ophthalmology Physician Providers in US
56
States with Ophthalmology Physician
1,420
Avg Claims per Provider
John Gambrill, MD's 875 claims are below the specialty average of 1,420.
Nearby Ophthalmology Physician Providers in Maryland
Other clinicians with the same primary specialty enrolled in Maryland, drawn from the same CMS NPPES roster as Gambrill.
Dr. Abdulrahman Abodarahim
MBBCH
Baltimore, MD
Dr. Donald Abrams
M.D.
Baltimore, MD
Dr. Lisa Abrams
M.D.
Lutherville, MD
Dr. Neal Adams
MD
Silver Spring, MD
Dr. Arturo Aglubat
M.D.
Bel Air, MD
Compare Ophthalmology 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 Maryland medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Ophthalmology 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 John Gambrill, MD's specialty? ▼
John Gambrill, MD specializes in Ophthalmology Physician and practices in Catonsville, Maryland. Credentials: MD.
How much does John Gambrill, MD prescribe under Medicare Part D? ▼
In 2023, John Gambrill, MD wrote 875 Medicare Part D claims totaling $135K in drug costs for 191 beneficiaries.
What is John Gambrill, MD's Medicare quality score? ▼
John Gambrill, MD has a CMS MIPS Final Score of 78.5/100 (Quality: 80.4, Cost: 64.7). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is John Gambrill, MD located? ▼
John Gambrill, MD is located at 715 MAIDEN CHOICE LN, Catonsville, MD, 21228. Phone: (410) 247-5602.
What is John Gambrill, MD's NPI number? ▼
John Gambrill, MD's National Provider Identifier (NPI) is 1710033022, issued on 01/27/2007.
Does John Gambrill, MD prescribe more brand-name or generic drugs? ▼
John Gambrill, MD's prescribing is 31% brand-name and 69% generic drugs by claim count, with $103K in brand drug costs.
How many Ophthalmology Physician providers are there in the US? ▼
There are 22,082 Ophthalmology Physician providers across 56 states in the US. The average Ophthalmology Physician provider writes 1,420 Medicare Part D claims per year.
What drugs does John Gambrill, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, John Gambrill, MD's most frequently prescribed drugs include Latanoprost, Dorzolamide-Timolol, Timolol Maleate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does John Gambrill, MD accept Medicare? ▼
John Gambrill, MD appears in CMS Medicare data with 875 Part D claims and 191 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify John Gambrill, MD's credentials? ▼
John Gambrill, MD's NPI is 1710033022 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.
- 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 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.