Joel William Knaack, DO
Internal Medicine Physician · Traverse City, MI
Joel William Knaack, DO is an internal medicine physician with a practice address in Traverse City, Michigan, and NPI 1841236460, issued on Jun 21, 2006. Check the license (Michigan 5101016880, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Joel William Knaack
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 5101016880 MI
Self-reported in NPPES; status is on the state search - Practice location
- 1105 Sixth St, Traverse City, MI 49684
- Phone
- (231) 935-5000
- Enumerated
- Jun 21, 2006
- Record last updated
- Aug 1, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (231) 346-6017
- Medicare enrollment
- Enrolled (PECOS I20100331000740); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,735 in Michigan → Look up another NPI →
Also registered at 1105 Sixth St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Joel William Knaack in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 5101016880Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average internal medicine physician in 2024
219 Medicare Part D claims for 126 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 16 claims were for opioids.
Most prescribed
- Pantoprazole Sodium20 claims
- Prednisone16 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.
Bills Medicare through 3 group practices
- Grand Traverse Physician Services PCTraverse City, MI
- North Michigan Physician Services PCGrayling, MI
- Sound Inpatient Physicians-Michigan PLLCTawas City, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joel William Knaack among 5,735 internal medicine physician records in Michigan
Joel William Knaack, DO is one of 5,735 internal medicine physician records with a practice address in Michigan. 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 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 60% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2006 · median 2006 among the 3,564 with a school on file
- Record last updated2016 · 54% 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 Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
93 internal medicine physician records list a practice address in Traverse City
They are 93 of the 3,536 NPPES records with a practice address in Traverse City, and 5,735 internal medicine physician records in Michigan.
All 5,735 in Michigan → Every provider in Traverse City → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Troy Ahlstrom, M.D.Traverse City, MI 496841548265911
- Natalie Brown, M.D., PHDTraverse City, MI 496841427053529
- Elizabeth Elliot, D.O.Traverse City, MI 496841013919109
- David Friar, M.D.Traverse City, MI 496841720083108
- Kenneth Friar, M.D.Traverse City, MI 496841730184847
- William Howard, MDTraverse City, MI 496841588669725
- David Macdougall, MDTraverse City, MI 496841659376416
- Michael Salata, M.D.Traverse City, MI 496841275538670
Common questions
What is Joel William Knaack, DO's NPI number?
Joel William Knaack, DO's National Provider Identifier (NPI) is 1841236460, issued on Jun 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joel William Knaack, DO located?
The NPPES record lists a practice address at 1105 Sixth St, Traverse City, MI, 49684. Phone: (231) 935-5000. Providers update this record themselves, so call before visiting.
How can I verify Joel William Knaack, DO's license?
NPPES lists Michigan license number 5101016880, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Joel William Knaack, DO prescribe under Medicare Part D?
In 2024, Joel William Knaack, DO had 219 Medicare Part D claims for 126 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.