Mary Marschner, M.D.
NPI 1801279476 · Internal Medicine Physician · Nashville, TN
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Marschner, M.D. is a Internal Medicine Physician provider in Nashville, TN (NPI 1801279476).
Provider details
- NPI number
- 1801279476
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- 68912 (TN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Hospitals
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
10 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
245 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 158 | $69 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 40 | $107 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 25 | $71 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 11 | $111 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 11 | $105 |
Typical Medicare-allowed amounts for these services range $69–$111 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Additional practice locations (1)
- 330 Mount Auburn StCambridge, MA 02138-5502Phone: (617) 499-5571
Registry dates
- Enumerated
- 2015-07-01
- Last updated
- 2023-10-26
- Certified
- 2023-10-26
Frequently asked questions
- What is Mary Marschner's NPI number?
- Mary Marschner's National Provider Identifier (NPI) is 1801279476, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Marschner's specialty?
- Mary Marschner is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Marschner located?
- Mary Marschner's practice location on file with NPPES is 3601 the Vanderbilt Clinic, Nashville, TN 37232-5502.
- What is Mary Marschner's phone number?
- The practice phone number listed in the NPPES registry for Mary Marschner is (615) 322-3000.
- Does Mary Marschner accept Medicare?
- Mary Marschner is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Marschner's NPI active?
- Yes — Mary Marschner's NPI (1801279476) is active in the NPPES registry as of the last update on 2023-10-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.