NPI registry status
Active
2026 NPPES data Ophthalmology Physician NPI 1568455897 MD
Verify on CMS → Glen Bolliger, MD
Ophthalmology Physician in Chelmsford, Massachusetts.
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
214
Medicare Part D claims · 91 beneficiaries · Ophthalmology Physician avg: 1K
Generic prescribing
83%
generic claims · 17% 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
Glen Bolliger, MD filed 214 Medicare Part D claims in 2023 as a Ophthalmology Physician in Chelmsford, Massachusetts, prescribing 83% generic.
- 214
- Part D claims, 2023
- 83%
- 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.
Glen Bolliger, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
214 49th percentile higher than 49% 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)
Glen Bolliger, MD 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 Glen Bolliger, MD?
Quality data not reportedPrimary specialty
Ophthalmology Physician
Medicare Part D claims
214 85% vs specialty avg
Specialty distribution in Massachusetts
How Ophthalmology Physician compares to other specialties among Massachusetts 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 Ophthalmology 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).
Glen Bolliger, MD appears in the CMS NPPES registry as an Ophthalmology Physician provider holding MD credentials at 19 VILLAGE SQ, Chelmsford, MA, 01824, with a listed phone of (978) 256-5600. NPI 1568455897 was issued on 08/23/2005.
Medicare Part D records for calendar year 2023 show 214 prescription claims written by this provider, covering 91 Medicare beneficiaries and totaling roughly $25K in drug spend, split 17% brand-name and 83% generic by claim count.
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 | 1568455897 |
|---|---|
| Specialty | Ophthalmology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 08/23/2005 |
License & disciplinary context - Massachusetts BORIM 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~38K Massachusetts medical licensees in 2023 - they are NOT specific to Glen Bolliger, MD. To verify Glen Bolliger, MD's current license status, search the BORIM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
80
Total board actions, Massachusetts 2023
Across 78 cases
2.11
Actions per 1,000 licensees
Massachusetts statewide rate
probation
Most common action type
29 cases
BORIM publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Massachusetts disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Glen Bolliger, MD - brand share 17.0%
Ophthalmology Physician average
17% brand-name claims vs 83% generic, on 214 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.
214
Total Claims
$25K
Total Drug Cost
91
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 516
- Total Day Supply
- 15,389
- Brand vs Generic
- 17% brand / 83% generic
- Brand Drug Cost
- $18K
- Generic Drug Cost
- $7K
Patient Demographics
- Average Patient Age
- 79.5 years
- Avg HCC Risk Score
- 1.27
- Gender Split
- 51% female / 49% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Glen Bolliger, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Latanoprost
Latanoprost
89 claims
- Dorzolamide Hcl 30
Dorzolamide Hcl
30 claims
- Timolol Maleate 25
Timolol Maleate
25 claims
- Brimonidine Tartrate 23
Brimonidine Tartrate
23 claims
- Dorzolamide-Timolol 17
Dorzolamide-Timolol
17 claims
| Drug | Claims |
|---|---|
| Latanoprost | 89 |
| Dorzolamide Hcl | 30 |
| Timolol Maleate | 25 |
| Brimonidine Tartrate | 23 |
| Dorzolamide-Timolol Dorzolamide Hcl/Timolol Maleat | 17 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Ophthalmology Physician Overview
How Glen Bolliger, 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
Glen Bolliger, MD's 214 claims are below the specialty average of 1,420.
Nearby Ophthalmology Physician Providers in Massachusetts
Other clinicians with the same primary specialty enrolled in Massachusetts, drawn from the same CMS NPPES roster as Bolliger.
Dr. Mark Abelson
M.D.
Andover, MA
Dr. Inas Aboobakar
M.D.
Boston, MA
Dr. Alessandro Adad Jammal
MD, PHD
Boston, MA
Dr. David Agahigian
M.D.
Springfield, MA
Dr. Kanika Agarwal
MD
Boston, MA
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 Massachusetts 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 Glen Bolliger, MD's specialty? ▼
Glen Bolliger, MD specializes in Ophthalmology Physician and practices in Chelmsford, Massachusetts. Credentials: MD.
How much does Glen Bolliger, MD prescribe under Medicare Part D? ▼
In 2023, Glen Bolliger, MD wrote 214 Medicare Part D claims totaling $25K in drug costs for 91 beneficiaries.
Where is Glen Bolliger, MD located? ▼
Glen Bolliger, MD is located at 19 VILLAGE SQ, Chelmsford, MA, 01824. Phone: (978) 256-5600.
What is Glen Bolliger, MD's NPI number? ▼
Glen Bolliger, MD's National Provider Identifier (NPI) is 1568455897, issued on 08/23/2005.
Does Glen Bolliger, MD prescribe more brand-name or generic drugs? ▼
Glen Bolliger, MD's prescribing is 17% brand-name and 83% generic drugs by claim count, with $18K 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 Glen Bolliger, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Glen Bolliger, MD's most frequently prescribed drugs include Latanoprost, Dorzolamide Hcl, Timolol Maleate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Glen Bolliger, MD accept Medicare? ▼
Glen Bolliger, MD appears in CMS Medicare data with 214 Part D claims and 91 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Glen Bolliger, MD's credentials? ▼
Glen Bolliger, MD's NPI is 1568455897 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
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.