DR. GREGORY L. PENNER M.D.
NPI 1275610198
Specialist in Brunswick, ME

Q: What is Gregory Penner's NPI number?

The NPI number for Gregory Penner is 1275610198. It was assigned to this individual provider in the NPPES registry on November 1, 2006.

Q: What is Gregory Penner's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

Q: When was this NPI record last updated?

The NPPES record for Gregory Penner was last updated on June 22, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since November 01, 2006PECOS EnrolledAccepts Medicare Assignment

98.06/100

CMS Quality Rating

331 MAINE ST STE 4, BRUNSWICK, ME 04011(207) 721-0911(207) 721-9729 Get Directions Write a Review

NPPES record last updated: June 22, 2015. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About Dr. Gregory L. Penner M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. GREGORY L. PENNER M.D. (NPI 1275610198) is an individual specialist in Brunswick, Maine, licensed in Maine (12949) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS, is affiliated with Maine Medical Center, and is a graduate of Loma Linda University School Of Medicine (1983).

NPPES Registry Identity

NPI1275610198

Entity TypeIndividualMale

Primary Taxonomy174400000X

Provider Legal NameDR. GREGORY L. PENNERCredential: M.D.

Location Address331 MAINE ST STE 4Brunswick, ME 04011-3359

Mailing Address331 Maine St, Suite 4Brunswick, ME 04011-3358 · (207) 721-0911 · Fax (207) 721-9729

Phone(207) 721-0911

Fax(207) 721-9729

Sole ProprietorYes

Medical School CMSLoma Linda University School Of MedicineGraduated 1983

Enumeration DateNovember 1, 2006

Last NPPES UpdateJune 22, 2015

✔ NPI 1275610198 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpecialistOther Service Providers

Taxonomy Code174400000X

License✔ Licensed in ME · 12949

Definition

An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.

331 MAINE ST STE 4, Brunswick, ME 04011

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Other Identifiers 6

Other017636ME · Bs

Other1027557ME · Aetna

Medicaid122050000ME

Medicare PINMM3075ME

Medicare UPINC93501ME

Medicare PINE400187362ME

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Harvard Pilgrim Health Care.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Gregory L. Penner M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1850289869

PECOS Enrollment IDI20040310000106

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Gregory Penner reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Mainehealth

4.0 mi

Multi-Specialty

123 MEDICAL CENTER DR
Brunswick, ME 04011

Reassigned Medicare billing, Maine enrollment
3,140 clinicians in this Medicare group

NPI 1902422561 (207) 729-0181

St. Mary's Regional Medical Center

18 mi

General Acute Care Hospital

93 CAMPUS AVE
Lewiston, ME 04240

Reassigned Medicare billing, Maine enrollment
Medicare enrollment name: St Marys Regional Medical Center
381 clinicians in this Medicare group

NPI 1447226584 (207) 777-8100

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 11

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

118 services95 patients

Removal of impacted ear wax 69210

Impacted ear wax removal is a safe procedure to clear blockages in the ear canal caused by hardened ear wax. A healthcare professional uses specialized tools or a gentle irrigation method to loosen and remove the wax, improving hearing and alleviating discomfort.

83 services61 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

80 services80 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

63 services51 patients

Exam of ear using a microscope 92504

An exam of the ear using a microscope allows a detailed view of the ear structures. This non-invasive procedure helps identify issues such as infections, blockages, or ear damage. It's a safe, quick, and painless way to evaluate ear health.

51 services47 patients

Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212

This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.

51 services28 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Maine Medical Center

Acute Care Hospitals · Portland, ME

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number200009

Location22 Bramhall StPortland, ME 04102 · Cumberland County

Emergency services Birthing friendly

Mid Coast Hospital

Acute Care Hospitals · Brunswick, ME

2/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number200021

Location123 Medical Center DriveBrunswick, ME 04011 · Cumberland County

Emergency services Birthing friendly

Maine General Medical Center

Acute Care Hospitals · Augusta, ME

5/5 CMS rating

OwnershipVoluntary non-profit - Other

CMS Certification Number200039

Location35 Medical Center ParkwayAugusta, ME 04330 · Kennebec County

Emergency services Birthing friendly

Waldo County General Hospital

Critical Access Hospitals · Belfast, ME

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number201312

Location118 Northport AveBelfast, ME 04915 · Waldo County

Emergency services Birthing friendly

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

98.06/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored through an Alternative Payment Model

Quality

86.13

Promoting Interoperability

100

Improvement Activities

Other Providers at the Same Location NPPES 4

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

AMBER ECKERSON DMD

Dentist (General Practice)

331 MAINE ST STE 4
BRUNSWICK, ME 04011

Cumberland County (207) 721-9277

MICHELLE HAMMOND BARBER NP

Nurse Practitioner

331 MAINE ST STE 4
BRUNSWICK, ME 04011

Cumberland County (207) 721-9277

OASIS HEALTH NETWORK, INC.

Voluntary or Charitable

331 MAINE ST STE 4
BRUNSWICK, ME 04011

Cumberland County (207) 721-9277

DR. PETER D O'CONNOR M.D., O.D.

Otolaryngology

331 MAINE ST STE 4
BRUNSWICK, ME 04011

Cumberland County (207) 721-0911

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gregory Penner's NPI number?

The NPI number for Gregory Penner is 1275610198. It was assigned to this individual provider in the NPPES registry on November 1, 2006.

Where is Gregory Penner located?

Gregory Penner practices at 331 Maine St Ste 4, Brunswick, ME 04011. The listed phone number is (207) 721-0911.

What is Gregory Penner's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

Is Gregory Penner enrolled in Medicare?

Yes. Gregory Penner is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Gregory Penner's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Penner reassigns Medicare benefits to 2 organizations: Mainehealth (Brunswick, ME) and St. Mary's Regional Medical Center (Lewiston, ME). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Gregory Penner's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Gregory Penner accept?

Health plans from Harvard Pilgrim Health Care list Gregory Penner as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Gregory Penner affiliated with any hospitals?

According to CMS data, Gregory Penner is affiliated with Maine Medical Center, Mid Coast Hospital, Maine General Medical Center and Waldo County General Hospital.

When was this NPI record last updated?

The NPPES record for Gregory Penner was last updated on June 22, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.