Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Joel William Knaack, DO

Individual provider Internal Medicine Physician · NPI 1841236460

Joel William Knaack, DO practises Internal Medicine in Traverse City, Michigan. Qualified in 2006, 20 years ago. Practices with North Michigan Physician Services PC, a 66-clinician group and accepts Medicare assignment. Licensed in Michigan.

Years since qualifying
20
Licensed in
MI
In the registry since
2006
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

1105 Sixth St
Traverse City, MI 49684-2349 Not confirmed with CMS for 10 years — call before visiting
Phone: (231) 935-5000
Fax: (231) 346-6017
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 5101016880 (MI)

Record details

NPI number1841236460
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJune 21, 2006
Last updated in NPPESAugust 1, 2016

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2006 (20 years in practice)
Group practice North Michigan Physician Services Pc — 66 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients218
Services billed 619 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at North Michigan Physician Services PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 66 clinicians in the practice; 12 are shown here.

Other providers in Traverse City