NPI registry status
Active
2026 NPPES data Colon & Rectal Surgery Physician NPI 1386711877 DO
Verify on CMS → Brian Gillis, DO
Colon & Rectal Surgery Physician in Oakland, Maine.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 1,608 in Colon & Rectal Surgery 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
363
Medicare Part D claims · 131 beneficiaries · Colon & Rectal Surgery Physician avg: 196
Generic prescribing
90%
generic claims · 10% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$79.53
4 payments · CMS Open Payments (Sunshine Act)
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
Brian Gillis, DO filed 363 Medicare Part D claims in 2023 as a Colon & Rectal Surgery Physician in Oakland, Maine, prescribing 90% generic.
- 363
- Part D claims, 2023
- 90%
- generic prescribing
- $79.53
- industry payments (Sunshine Act)
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.
Brian Gillis, DO's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
363 Top 43% higher than 57% 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)
Brian Gillis, DO 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 Brian Gillis, DO?
Quality data not reportedPrimary specialty
Colon & Rectal Surgery Physician
Medicare Part D claims
363 85% vs specialty avg
Specialty distribution in Maine
How Colon & Rectal Surgery Physician compares to other specialties among Maine 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 Colon & Rectal Surgery 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).
Brian Gillis, DO appears in the CMS NPPES registry as a Colon & Rectal Surgery Physician provider holding DO credentials at 8 WATER ST, Oakland, ME, 04963, with a listed phone of (207) 465-3003. NPI 1386711877 was issued on 11/29/2006.
Medicare Part D records for calendar year 2023 show 363 prescription claims written by this provider, covering 131 Medicare beneficiaries and totaling roughly $53K in drug spend, split 10% brand-name and 90% generic by claim count.
Colon & Rectal Surgery Physician is a narrow specialty nationwide, with 1,608 enrolled providers across 50 states and an average of 196 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 | 1386711877 |
|---|---|
| Specialty | Colon & Rectal Surgery Physician |
| Credentials | DO |
| Gender | Male |
| NPI Issued | 11/29/2006 |
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 Brian Gillis, DO. Source: openpaymentsdata.cms.gov.
Total received
$80
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
Brian Gillis, DO - brand share 10.0%
Colon & Rectal Surgery Physician average
10% brand-name claims vs 90% generic, on 363 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.
363
Total Claims
$53K
Total Drug Cost
131
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 464
- Total Day Supply
- 10,862
- Brand vs Generic
- 10% brand / 90% generic
- Brand Drug Cost
- $44K
- Generic Drug Cost
- $9K
- Antibiotic Claims
- 34
Patient Demographics
- Average Patient Age
- 71.2 years
- Avg HCC Risk Score
- 0.97
- Gender Split
- 50% female / 50% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Brian Gillis, DO prescribes most
Top Medicare Part D drugs by claim count, 2023
- Hydrocortisone
Hydrocortisone
97 claims
- Procto-Med Hc 38
Procto-Med Hc
38 claims
- Cholestyramine 25
Cholestyramine
25 claims
- Gabapentin 23
Gabapentin
23 claims
- Dicyclomine Hcl 16
Dicyclomine Hcl
16 claims
- Cephalexin 15
Cephalexin
15 claims
- Linzess 15
Linzess
15 claims
| Drug | Claims |
|---|---|
| Hydrocortisone | 97 |
| Procto-Med Hc Hydrocortisone | 38 |
| Cholestyramine Cholestyramine (With Sugar) | 25 |
| Gabapentin | 23 |
| Dicyclomine Hcl | 16 |
| Cephalexin | 15 |
| Linzess Linaclotide | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Colon & Rectal Surgery Physician Overview
How Brian Gillis, DO fits within the Colon & Rectal Surgery Physician landscape nationally.
1,608
Colon & Rectal Surgery Physician Providers in US
50
States with Colon & Rectal Surgery Physician
196
Avg Claims per Provider
Brian Gillis, DO's 363 claims are above the specialty average of 196.
Nearby Colon & Rectal Surgery Physician Providers in Maine
Other clinicians with the same primary specialty enrolled in Maine, drawn from the same CMS NPPES roster as Gillis.
Dr. Kathreen Lee
MD
Portland, ME
Dr. Cathel Macleod
MD
Portland, ME
Melville Roberts
Portland, ME
Dr. Richard Stockwell
DO
Westbrook, ME
Compare Colon & Rectal Surgery 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 Maine medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Colon & Rectal Surgery 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 Brian Gillis, DO's specialty? ▼
Brian Gillis, DO specializes in Colon & Rectal Surgery Physician and practices in Oakland, Maine. Credentials: DO.
How much does Brian Gillis, DO prescribe under Medicare Part D? ▼
In 2023, Brian Gillis, DO wrote 363 Medicare Part D claims totaling $53K in drug costs for 131 beneficiaries.
Where is Brian Gillis, DO located? ▼
Brian Gillis, DO is located at 8 WATER ST, Oakland, ME, 04963. Phone: (207) 465-3003.
What is Brian Gillis, DO's NPI number? ▼
Brian Gillis, DO's National Provider Identifier (NPI) is 1386711877, issued on 11/29/2006.
Does Brian Gillis, DO prescribe more brand-name or generic drugs? ▼
Brian Gillis, DO's prescribing is 10% brand-name and 90% generic drugs by claim count, with $44K in brand drug costs.
How many Colon & Rectal Surgery Physician providers are there in the US? ▼
There are 1,608 Colon & Rectal Surgery Physician providers across 50 states in the US. The average Colon & Rectal Surgery Physician provider writes 196 Medicare Part D claims per year.
What drugs does Brian Gillis, DO prescribe most often? ▼
Based on 2023 Medicare Part D data, Brian Gillis, DO's most frequently prescribed drugs include Hydrocortisone, Procto-Med Hc, Cholestyramine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Brian Gillis, DO accept Medicare? ▼
Brian Gillis, DO appears in CMS Medicare data with 363 Part D claims and 131 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Brian Gillis, DO's credentials? ▼
Brian Gillis, DO's NPI is 1386711877 with credentials DO. 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.