Physician Profile
Unclaimed ProfileAbout GRENQUIST
Mark Francis Grenquist, DO is a hospitalist based in Chelsea, MI. Mark is a 2001 graduate of Michigan State University College of Human Medicine. Mark is also listed as specialising in internal medicine.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What kind of doctor is Dr. Grenquist?
Dr. Grenquist is a hospitalist in Chelsea, MI. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “HOSPITALIST”.
NPI registry
What is Dr. Grenquist's address?
Dr. Grenquist is listed at 775 S MAIN ST, Chelsea, MI 48118. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Grenquist?
The number on file is (734) 593-6000. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Grenquist's NPI number?
Dr. Grenquist's National Provider Identifier is 1942300454. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Grenquist train?
Dr. Grenquist attended Michigan State University College of Human Medicine, graduating in 2001. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Grenquist been practising?
Dr. Grenquist has 25 years experience. Calculated from a graduation year of 2001, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Grenquist perform?
According to Medicare billing data, Dr. Grenquist the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Grenquist confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Grenquist. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (734) 593-6000
- Email not available
Practice Locations
775 S MAIN ST
Chelsea, MI 48118
Procedures Most Often Billed to Medicare
299 services · 187 patients · 4 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
187 |
| Hospital discharge day management, more than 30 minutes | Office visit | 99239 |
67 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | Office visit | 99222 |
32 |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
13 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Trained at Michigan State University College of Human Medicine 8
Other providers in the same specialty who trained at the same institution.
More connections — 8 related providers in 1 group
Class of 2001 at Michigan State University College of Human Medicine 8
Providers who graduated from the same medical school in the same year.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.