Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Retina Center of Maine, LLC PA

Retina Specialist (Ophthalmology) Physician in Portland, ME · enumerated 2007 · authorized official Mark Balles, MD / Practice Owner.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1801077128

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Registry record

Entity type Organization (Type 2)

Legal business name Retina Center of Maine, LLC PA

Practice address 195 Fore River Pkwy Ste 480, Portland, ME, 04102

Phone (207) 773-3937

Fax (207) 773-0801

Enumeration date Nov 15, 2007

Last updated in NPPES Apr 18, 2017

Taxonomy & classification

207WX0107X Retina Specialist (Ophthalmology) Physician Allopathic & Osteopathic Physicians · License MD14047 (ME) Primary

Authorized official

Name Mark Balles

Title MD / Practice Owner

Phone (207) 773-3937

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Where is Retina Center of Maine, LLC PA located?

The practice location on file with NPPES is in Portland, ME.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2017-04-18. Verify at npiregistry.cms.hhs.gov.

Providers at this address

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Mark Balles Ophthalmology Physician · Portland, ME NPI 1780654392

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-04-18.