Mark Herring, M.D.
NPI 1386766368 · Internal Medicine Physician · Manitowoc, WI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Herring, M.D. is a Internal Medicine Physician provider in Manitowoc, WI (NPI 1386766368).
Provider details
- NPI number
- 1386766368
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 24825 (WI)
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
19 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
645 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 218 | $114 |
| Residence Visit for Established Patient With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99349 | 173 | $113 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 82 | $161 |
| Residence Visit for Established Patient With High Level of Medical Decision Making, Per Day, If Using Time, at Least 60 Minutes99350 | 72 | $164 |
| Removal of Impacted Ear Wax69210 | 43 | $42 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 73 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 192 | 33 |
| Losartan Potassium | 170 | 29 |
| Atorvastatin Calcium | 154 | 33 |
| Simvastatin | 151 | 31 |
| Warfarin Sodium | 146 | 19 |
| Furosemide | 144 | 35 |
| Amlodipine Besylate | 130 | 24 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-04-03
- Last updated
- 2007-07-08
Frequently asked questions
- What is Mark Herring's NPI number?
- Mark Herring's National Provider Identifier (NPI) is 1386766368, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Herring's specialty?
- Mark Herring is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Herring located?
- Mark Herring's practice location on file with NPPES is 1355 Johnston Dr, Manitowoc, WI 54220-2131.
- What is Mark Herring's phone number?
- The practice phone number listed in the NPPES registry for Mark Herring is (920) 682-2747.
- Does Mark Herring accept Medicare?
- Mark Herring is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Herring's NPI active?
- Yes — Mark Herring's NPI (1386766368) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.