Mark Flemmer, M.D.
NPI 1639143217 · Internal Medicine Physician · Norfolk, VA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Flemmer, M.D. is a Internal Medicine Physician provider in Norfolk, VA (NPI 1639143217).
Provider details
- NPI number
- 1639143217
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 0101049048 (VA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
515 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 | 170 | $75 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 73 | $124 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 67 | $47 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 65 | $77 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 56 | $123 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 27 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 132 | 31 |
| Losartan Potassium | 77 | 21 |
| Rosuvastatin Calcium | 75 | 22 |
| Atorvastatin Calcium | 59 | 17 |
| Tamsulosin Hcl | 41 | — |
| Lisinopril | 40 | — |
| Chlorthalidone | 38 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-13
- Last updated
- 2020-02-18
- Certified
- 2020-02-18
Frequently asked questions
- What is Mark Flemmer's NPI number?
- Mark Flemmer's National Provider Identifier (NPI) is 1639143217, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Flemmer's specialty?
- Mark Flemmer is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Flemmer located?
- Mark Flemmer's practice location on file with NPPES is 825 Fairfax Ave, Norfolk, VA 23507-1914.
- What is Mark Flemmer's phone number?
- The practice phone number listed in the NPPES registry for Mark Flemmer is (757) 889-5432.
- Does Mark Flemmer accept Medicare?
- Mark Flemmer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Flemmer's NPI active?
- Yes — Mark Flemmer's NPI (1639143217) is active in the NPPES registry as of the last update on 2020-02-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.