Timothy W. Warren, DO
Family Medicine Physician · Hummelstown, PA
Timothy W. Warren, DO is a family medicine physician with a practice address in Hummelstown, Pennsylvania, and NPI 1902435373, issued on Apr 7, 2020. Check the license (Pennsylvania OS021581, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Timothy W. Warren
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- OS021581 PA
Self-reported in NPPES; status is on the state search - Practice location
- 300 E Main St, Hummelstown, PA 17036
- Phone
- (717) 566-1100
- Enumerated
- Apr 7, 2020
- Record last updated
- Apr 7, 2025
- Fax
- (717) 566-0600
- Medicare enrollment
- Enrolled (PECOS I20230505002570); accepts Medicare assignment
- Medical or professional school
- Lake Erie College Of Osteopathic Medicine, Erie, 2020
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 7,483 in Pennsylvania → Look up another NPI →
Also registered at 300 E Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Amy Casale, PA-CPhysician Assistant1134604911
- Todd Fisher, MDFamily Medicine Physician1336104504
- Christopher Gregorich, PA-CPhysician Assistant1730284829
- Evelyn Hetherington, PTAPhysical Therapy Assistant1235554312
- Mary Karis, CRNPNurse Practitioner1790448355
- Timothy McDonald, MSPTPhysical Therapist1336307917
Verify Timothy W. Warren in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license OS021581Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average family medicine physician in 2024
345 Medicare Part D claims for 276 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Methylprednisolone55 claims
- Nitrofurantoin Mono-Macro36 claims
- Amoxicillin33 claims
- Amoxicillin-Clavulanate Potass27 claims
- Doxycycline Monohydrate27 claims
- Albuterol Sulfate Hfa17 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): 82.5 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
- Family Practice Center PCHummelstown, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Timothy W. Warren among 7,483 family medicine physician records in Pennsylvania
Timothy W. Warren, DO is one of 7,483 family medicine physician records with a practice address in Pennsylvania. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 83% of them.
- NPI issued2020 · 83% of these records are older, 14% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 61% of these records are
- Graduated2020 · median 2005 among the 4,529 with a school on file
- Record last updated2025 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
8 family medicine physician records list a practice address in Hummelstown
They are 8 of the 322 NPPES records with a practice address in Hummelstown, and 7,483 family medicine physician records in Pennsylvania.
All 7,483 in Pennsylvania → Every provider in Hummelstown → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Todd Fisher, MDHummelstown, PA 170361336104504
- Dudley Gordon, MDHummelstown, PA 170361245298074
- Mark Lauer, M.D.Hummelstown, PA 170361134288053
- Marko Miljkovic, M.D.Hummelstown, PA 170361821208414
- John Muscalus, DOHummelstown, PA 170361710919774
- Sean Rhoads, PA-CHummelstown, PA 170361548227499
- Joseph Thomas, DOHummelstown, PA 170361316459480
- Larry Espenshade, DOHighspire, PA 170341326010786
Common questions
What is Timothy W. Warren, DO's NPI number?
Timothy W. Warren, DO's National Provider Identifier (NPI) is 1902435373, issued on Apr 7, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Timothy W. Warren, DO located?
The NPPES record lists a practice address at 300 E Main St, Hummelstown, PA, 17036. Phone: (717) 566-1100. Providers update this record themselves, so call before visiting.
How can I verify Timothy W. Warren, DO's license?
NPPES lists Pennsylvania license number OS021581, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Timothy W. Warren, DO prescribe under Medicare Part D?
In 2024, Timothy W. Warren, DO had 345 Medicare Part D claims for 276 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Timothy W. Warren, DO's MIPS final score?
The 2023 MIPS final score is 82.5 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.