Mary Alexis Duffy, M.D.
Contractor · Chattanooga, TN
Mary Alexis Duffy, M.D. is a contractor with a practice address in Chattanooga, Tennessee, and NPI 1730330028, issued on Oct 4, 2008. Check the license (Tennessee MEDICAL TN012927, as entered in NPPES) with the Tennessee board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mary Alexis Duffy
- Credential
- M.D.
- Primary taxonomy
- Contractor 171W00000X
- License number
- MEDICAL TN012927 TN
Self-reported in NPPES; status is on the state search - Practice location
- 255 S Crest RD, Chattanooga, TN 37404
- Phone
- (423) 698-4211
- Enumerated
- Oct 4, 2008
- Record last updated
- Oct 4, 2008 (not updated in 18 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest contractor records → All 71 in Tennessee → Look up another NPI →
Verify Mary Alexis Duffy in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Tennessee board licenses this profession
Search for license MEDICAL TN012927Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average contractor in 2024
33 Medicare Part D claims, against an average of 483 among the 15 providers of this specialty who prescribed in Part D.
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.
Mary Alexis Duffy among 71 contractor records in Tennessee
Mary Alexis Duffy, M.D. is one of 71 contractor records with a practice address in Tennessee. 1% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 7% of them.
- NPI issued2008 · 7% of these records are older, 86% newer
- In a Medicare fileYes · 1% of these records are
- In the CMS Doctors and Clinicians fileNo · 0% of these records are
- Record last updated2008 · 76% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 171W00000X and a Tennessee practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Contractor providers in Tennessee
There are 71 contractor records in Tennessee.
All 71 in Tennessee → Every provider in Chattanooga → Contractor nationwide →
The 8 contractor records with the nearest ZIP codes
- Shantaye ThompsonChattanooga, TN 374041326862012
- Elizabeth Eaton, LMTTullahoma, TN 373881285885723
- Mary CampbellChattanooga, TN 374211124588082
- Isabella CarvajalChattanooga, TN 374211407722580
- Manuel CarvajalChattanooga, TN 374211336015437
- Rebecca Vincent, LMTChattanooga, TN 374211982924130
- Megan Taylor, MTBCOoltewah, TN 373631619125846
- Christopher TurnerManchester, TN 373551306153523
Common questions
What is Mary Alexis Duffy, M.D.'s NPI number?
Mary Alexis Duffy, M.D.'s National Provider Identifier (NPI) is 1730330028, issued on Oct 4, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Mary Alexis Duffy, M.D. located?
The NPPES record lists a practice address at 255 S Crest RD, Chattanooga, TN, 37404. Phone: (423) 698-4211. Providers update this record themselves, so call before visiting.
How can I verify Mary Alexis Duffy, M.D.'s license?
NPPES lists Tennessee license number MEDICAL TN012927, as entered by the provider. Search the Tennessee board that licenses this profession; the NPPES record confirms identity only.
How much does Mary Alexis Duffy, M.D. prescribe under Medicare Part D?
In 2024, Mary Alexis Duffy, M.D. had 33 Medicare Part D claims; the average among contractor prescribers was 483. Part D covers Medicare prescriptions only.
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.