Timothy J. Grass, D.O.
Family Medicine Physician · Franklin, WI
Timothy J. Grass, D.O. is a family medicine physician with a practice address in Franklin, Wisconsin, and NPI 1982719134, issued on Aug 20, 2006. Check the license (Wisconsin 38321, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Timothy J. Grass
- Credential
- D.O.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 38321 WI
Self-reported in NPPES; status is on the state search - Practice location
- 10101 S 27TH St, Franklin, WI 53132
- Phone
- (414) 325-4940
- Enumerated
- Aug 20, 2006
- Record last updated
- Mar 7, 2023
- Medicaid ID
- 30091700 WI
- Medicare enrollment
- Enrolled (PECOS I20050216000564); accepts Medicare assignment
- Medical or professional school
- Midwestern University, Chicago College Of Osteopathic Med, 1995
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →
Also registered at 10101 S 27TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Isabelle Anderson, PAMedical Physician Assistant1023845427
- Martha Aregbesola, N.P.Nurse Practitioner1013096262
- Zachary AsikPhysical Therapist1932046406
- Jarek BergOrthopedic Physical Therapist1780574228
- Hannah BlomOccupational Therapist1639069966
- Bridget Coghlan, PT, LATPhysical Therapist1225306038
Verify Timothy J. Grass in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 38321Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
49% more Medicare Part D claims than the average family medicine physician in 2024
5,263 Medicare Part D claims for 502 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 118 claims were for opioids.
Most prescribed
- Atorvastatin Calcium509 claims
- Rosuvastatin Calcium355 claims
- Lisinopril343 claims
- Levothyroxine Sodium228 claims
- Amlodipine Besylate208 claims
- Metformin Hcl158 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): 82.4 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).
Industry payments in 2024: $51.06
2 payments; by number, the most common kind was food and beverage; the largest payer was Dynavax Technologies Corporation. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Ascension Medical Group-Southeast Wisconsin IncBrookfield, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Timothy J. Grass among 3,765 family medicine physician records in Wisconsin
Timothy J. Grass, D.O. is one of 3,765 family medicine physician records with a practice address in Wisconsin. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 46% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1995 · median 2007 among the 2,347 with a school on file
- Record last updated2023 · 56% 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 Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
21 family medicine physician records list a practice address in Franklin
They are 21 of the 676 NPPES records with a practice address in Franklin, and 3,765 family medicine physician records in Wisconsin.
All 3,765 in Wisconsin → Every provider in Franklin → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Michael D'Amico, MDFranklin, WI 531321386722866
- Daniel Donovan, D.O.Franklin, WI 531321912926791
- Patricia Golden, D.O.Franklin, WI 531321184633562
- Susan Hill, M.D.Franklin, WI 531321255446340
- Thomas Jensen, M.D.Franklin, WI 531321548292436
- Gary Kamer, MDFranklin, WI 531321447266150
- Geoffrey Scott, MDFranklin, WI 531321528029949
- Aamir Siddiqi, MDFranklin, WI 531321730296930
Common questions
What is Timothy J. Grass, D.O.'s NPI number?
Timothy J. Grass, D.O.'s National Provider Identifier (NPI) is 1982719134, issued on Aug 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Timothy J. Grass, D.O. located?
The NPPES record lists a practice address at 10101 S 27TH St, Franklin, WI, 53132. Phone: (414) 325-4940. Providers update this record themselves, so call before visiting.
How can I verify Timothy J. Grass, D.O.'s license?
NPPES lists Wisconsin license number 38321, 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 Timothy J. Grass, D.O. prescribe under Medicare Part D?
In 2024, Timothy J. Grass, D.O. had 5,263 Medicare Part D claims for 502 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Timothy J. Grass, D.O.'s MIPS final score?
The 2023 MIPS final score is 82.4 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.