Mark Leonard Herring, M.D.
Internal Medicine Physician · Manitowoc, WI
Mark Leonard Herring, M.D. is an internal medicine physician with a practice address in Manitowoc, Wisconsin, and NPI 1386766368, issued on Apr 3, 2007. Check the license (Wisconsin 24825, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Mark Leonard Herring
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 24825 WI
Self-reported in NPPES; status is on the state search - Practice location
- 1355 Johnston Dr, Manitowoc, WI 54220
- Phone
- (920) 682-2747
- Enumerated
- Apr 3, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (920) 686-1498
- Medicare enrollment
- Enrolled (PECOS I20110323000537); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,078 in Wisconsin → Look up another NPI →
Verify Mark Leonard Herring in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 24825Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
24% more Medicare Part D claims than the average internal medicine physician in 2024
3,925 Medicare Part D claims for 205 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 195 claims were for opioids.
Most prescribed
- Levothyroxine Sodium192 claims
- Losartan Potassium170 claims
- Atorvastatin Calcium154 claims
- Simvastatin151 claims
- Warfarin Sodium146 claims
- Furosemide144 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 82.8 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Froedtert Manitowoc Medical Group, LLCSheboygan, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Leonard Herring among 2,078 internal medicine physician records in Wisconsin
Mark Leonard Herring, M.D. is one of 2,078 internal medicine physician records with a practice address in Wisconsin. 70% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 54% of them.
- NPI issued2007 · 54% of these records are older, 40% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1981 · median 2002 among the 1,098 with a school on file
- Record last updated2007 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
15 internal medicine physician records list a practice address in Manitowoc
They are 15 of the 765 NPPES records with a practice address in Manitowoc, and 2,078 internal medicine physician records in Wisconsin.
All 2,078 in Wisconsin → Every provider in Manitowoc → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Khalid Abdelgadir, MDManitowoc, WI 542201407433295
- Beverly Calub, M.D.Manitowoc, WI 542201316992993
- Mark Capriolo, MDManitowoc, WI 542201851466759
- Robert Cornwell, MDManitowoc, WI 542201568448025
- Pradeep Giriyappa, M.D.Manitowoc, WI 542201891803862
- Mary Govier, M.D.Manitowoc, WI 542201073621199
- Michael Hiebert, MDManitowoc, WI 542201407841224
- Michael Hoftiezer, M.D.Manitowoc, WI 542201639287618
Common questions
What is Mark Leonard Herring, M.D.'s NPI number?
Mark Leonard Herring, M.D.'s National Provider Identifier (NPI) is 1386766368, issued on Apr 3, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Mark Leonard Herring, M.D. located?
The NPPES record lists a practice address at 1355 Johnston Dr, Manitowoc, WI, 54220. Phone: (920) 682-2747. Providers update this record themselves, so call before visiting.
How can I verify Mark Leonard Herring, M.D.'s license?
NPPES lists Wisconsin license number 24825, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Leonard Herring, M.D. prescribe under Medicare Part D?
In 2024, Mark Leonard Herring, M.D. had 3,925 Medicare Part D claims for 205 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Mark Leonard Herring, M.D.'s MIPS final score?
The 2023 MIPS final score is 82.8 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.
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.