Quick answers
- Does Howard R. Mertz accept Medicare assignment?
- Yes. Medicare's clinician data says Howard R. Mertz accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Howard R. Mertz see?
- In 2024, CMS data shows 918 Original Medicare patients and 3,500 services for Howard R. Mertz. This counts Original Medicare only and measures volume, not quality.
- What is Howard R. Mertz's NPI number?
- 1649278474. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Howard R. Mertz, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 918 |
|---|---|
| Services billed to Medicare | 3,500 |
| Different services or procedures | 59 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month (99439)1,365 services
- Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month (99490)734 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)203 services
- Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)169 services
- Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43235)121 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis50%
- Ischemic heart disease34%
- Anxiety28%
- Depression26%
Hospitals where Howard R. Mertz works
Medicare's Facility Affiliation Data lists Howard R. Mertz at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Ascension Saint Thomas HospitalNashville, TN · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 440082
- Tristar Centennial Medical CenterNashville, TN · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 440161
Practice locations
Addresses where Howard R. Mertz is enrolled with Medicare (CMS data updated October 2, 2026).
- 3443 Dickerson Pike, Suite 400Nashville, TN 37207 (615) 612‑2146
- 4220 Harding Pike, Suite AandbNashville, TN 37205 (615) 284‑6728
- 4230 Harding PikeNashville, TN 37205 (615) 297‑2700
Group practices
Medicare enrollment lists Howard R. Mertz as a member of this group (CMS data updated October 2, 2026).
- Advanced Diagnostic Imaging PC523 clinicians in the group
Specialties
- Gastroenterologyprimary
Other gastroenterologists in Nashville
Clinicians with the same Medicare primary specialty in Nashville, TN — not a recommendation.
Other clinicians in Advanced Diagnostic Imaging PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Baylor College Of Medicine |
| Graduation year | 1986 (40 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1649278474 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians