Brett Dennis Gerwin, M.D.
Ophthalmology Physician · Chattanooga, TN
Brett Dennis Gerwin, M.D. is an ophthalmology physician with a practice address in Chattanooga, Tennessee, and NPI 1306992003, issued on Jan 26, 2007. Check the license (Tennessee 45994, as entered in NPPES) on the Tennessee Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Brett Dennis Gerwin
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License numbers
- 45994 TN
26155 AL
Self-reported in NPPES; status is on the state search - Practice location
- 979 E 3RD St, Chattanooga, TN 37403
- Phone
- (423) 521-2820
- Enumerated
- Jan 26, 2007
- Record last updated
- Nov 11, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (423) 602-5594
- Medicaid ID
- 1517997 TN
- Medicare enrollment
- Enrolled (PECOS I20100610000567); accepts Medicare assignment
- Medical or professional school
- University Of Alabama School Of Medicine, 2007
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 366 in Tennessee → Look up another NPI →
Also registered at 979 E 3RD St
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Verify Brett Dennis Gerwin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTennessee Board of Medical Examiners
Search for license 45994Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average ophthalmology physician in 2024
242 Medicare Part D claims for 64 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 54% of claims.
Most prescribed
- Prednisolone Acetate54 claims
- Eylea35 claims
- Ketorolac Tromethamine20 claims
- Eplerenone19 claims
- Dorzolamide-Timolol12 claims
- Prednisone11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 97.3 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $138.96
6 payments; by number, the most common kind was food and beverage; the largest payer was Regeneron Healthcare Solutions, Inc. The 13,221 providers of this specialty with any payment received $4,535.02 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Brett Dennis Gerwin among 366 ophthalmology physician records in Tennessee
Brett Dennis Gerwin, M.D. is one of 366 ophthalmology physician records with a practice address in Tennessee. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 63% of them.
- NPI issued2007 · 63% of these records are older, 31% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 67% of these records are
- Graduated2007 · median 2002 among the 247 with a school on file
- Record last updated2021 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a Tennessee practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in Tennessee
There are 366 ophthalmology physician records in Tennessee.
All 366 in Tennessee → Every provider in Chattanooga → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Jemison Bowers, MDChattanooga, TN 374031205820685
- Harry Lawrence, M.D.Chattanooga, TN 374031053317925
- Paula Nicola, M.D.Chattanooga, TN 374031659319010
- Molly Seal, M.D.Chattanooga, TN 374031144227281
- Patrick Bowers, MDChattanooga, TN 374041780660977
- Fred Gregg, M.D.Chattanooga, TN 374041043394968
- Charles Kirby, MDChattanooga, TN 374111740282755
- Robert Levy, M.D.Chattanooga, TN 374111619397635
Common questions
What is Brett Dennis Gerwin, M.D.'s NPI number?
Brett Dennis Gerwin, M.D.'s National Provider Identifier (NPI) is 1306992003, issued on Jan 26, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Brett Dennis Gerwin, M.D. located?
The NPPES record lists a practice address at 979 E 3RD St, Chattanooga, TN, 37403. Phone: (423) 521-2820. Providers update this record themselves, so call before visiting.
How can I verify Brett Dennis Gerwin, M.D.'s license?
NPPES lists Tennessee license number 45994, as entered by the provider. Search the Tennessee Board of Medical Examiners at https://www.tn.gov/health/licensure/me.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Brett Dennis Gerwin, M.D. prescribe under Medicare Part D?
In 2024, Brett Dennis Gerwin, M.D. had 242 Medicare Part D claims for 64 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is Brett Dennis Gerwin, M.D.'s MIPS final score?
The 2023 MIPS final score is 97.3 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.