NPPES file of Aug 9, 2026

Howard R. Mertz, M.D.

Gastroenterology Physician · Nashville, TN

Howard R. Mertz, M.D. is a gastroenterology physician with a practice address in Nashville, Tennessee, and NPI 1649278474, issued on Jul 14, 2005. Check the license (Tennessee MD0000025618, as entered in NPPES) on the Tennessee Board of Medical Examiners; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1649278474
Name
Howard R. Mertz
Credential
M.D.
Primary taxonomy
Gastroenterology Physician 207RG0100X
License number
MD0000025618 TN
Self-reported in NPPES; status is on the state search
Practice location
4230 Harding Road, Nashville, TN 37205
Phone
(615) 383-0165
Enumerated
Jul 14, 2005
Record last updated
Dec 16, 2015 (not updated in 11 years: call before relying on the address or phone)
Fax
(615) 292-4657
Medicaid IDs
Q011232 TN
3384297 TN
Medicare enrollment
Enrolled (PECOS I20110302000373); accepts Medicare assignment
Medical or professional school
Baylor College Of Medicine, 1986
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest gastroenterology physician records → All 384 in Tennessee → Look up another NPI →

Also registered at 4230 Harding Road

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Nathan Hall, M.D.Internal Medicine Physician1679515431
  2. Ronald Pruitt, M.D.Gastroenterology Physician1770582140

Verify Howard R. Mertz in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersTennessee Board of Medical Examiners
    Search for license MD0000025618    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Tennessee license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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2.2 times the Medicare Part D claims of the average gastroenterology physician in 2024

1,815 Medicare Part D claims for 498 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.

  1. Howard Mertz1,815
  2. Specialty average811

Most prescribed

  1. Omeprazole295 claims
  2. Famotidine120 claims
  3. Pantoprazole Sodium102 claims
  4. Sucralfate52 claims
  5. Mesalamine50 claims
  6. Azathioprine48 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.

Industry payments in 2024: $3,408.59

181 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Howard Mertz$3,408.59
  2. Specialty average$5,015.95

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. Advanced Diagnostic Imaging PCNashville, TN

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Howard R. Mertz among 384 gastroenterology physician records in Tennessee

Howard R. Mertz, M.D. is one of 384 gastroenterology 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 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 74% newer
  • In a Medicare fileYes · 79% of these records are
  • In the CMS Doctors and Clinicians fileYes · 66% of these records are
  • Graduated1986 · median 2001 among the 255 with a school on file
  • Record last updated2015 · 48% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Tennessee practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Gastroenterology Physician providers in Tennessee

There are 384 gastroenterology physician records in Tennessee.

All 384 in Tennessee → Every provider in Nashville → Gastroenterology Physician nationwide →

The 8 gastroenterology physician records with the nearest ZIP codes

  1. Melvin Butler, M.D.Nashville, TN 372051609807163
  2. Jeffrey Eskind, M.D.Nashville, TN 372051972543205
  3. Daniel Gremillion, M.D.Nashville, TN 372051467739573
  4. Rohan Mandaliya, M.D.Nashville, TN 372051679838510
  5. Anna Owings, DONashville, TN 372051588151807
  6. Ronald Pruitt, M.D.Nashville, TN 372051770582140
  7. Robin Dalal, M.D.Nashville, TN 372041891011896
  8. George James, MDNashville, TN 372041043217854

Common questions

What is Howard R. Mertz, M.D.'s NPI number?

Howard R. Mertz, M.D.'s National Provider Identifier (NPI) is 1649278474, issued on Jul 14, 2005. An NPI identifies a provider in billing; it is not a license.

Where is Howard R. Mertz, M.D. located?

The NPPES record lists a practice address at 4230 Harding Road, Nashville, TN, 37205. Phone: (615) 383-0165. Providers update this record themselves, so call before visiting.

How can I verify Howard R. Mertz, M.D.'s license?

NPPES lists Tennessee license number MD0000025618, 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 Howard R. Mertz, M.D. prescribe under Medicare Part D?

In 2024, Howard R. Mertz, M.D. had 1,815 Medicare Part D claims for 498 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.