Quick answers
- Does Mark D. Garwood accept Medicare assignment?
- Yes. Medicare's clinician data says Mark D. Garwood accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Mark D. Garwood see?
- In 2024, CMS data shows 242 Original Medicare patients and 265 services for Mark D. Garwood. This counts Original Medicare only and measures volume, not quality.
- What is Mark D. Garwood's NPI number?
- 1144231077. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Mark D. Garwood, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 242 |
|---|---|
| Services billed to Medicare | 265 |
| Different services or procedures | 16 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Sleep study in sleep lab (6 years or older) (95810)49 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)47 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)31 services
- Sleep study in sleep lab with continuous airway pressure (6 years or older) (95811)30 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)25 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol70%
- High blood pressure69%
- Arthritis38%
- Anxiety35%
- Depression33%
- Ischemic heart disease31%
Hospitals where Mark D. Garwood works
Medicare's Facility Affiliation Data lists Mark D. Garwood at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- University of Michigan Health SystemAnn Arbor, MI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 230046
Practice locations
Addresses where Mark D. Garwood is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 9; the Medicare profile lists all.
- 1500 E Medical Ctr DrAnn Arbor, MI 48109
- 1500 E Medical Ctr Dr 1st Fl, Taubman Ctr Rec DAnn Arbor, MI 48109 (734) 936‑4185
- 1500 E Medical Ctr Dr 1st Fl Rec D, Taubman CenterAnn Arbor, MI 48109 (734) 764‑5175
- 1500 E Medical Ctr Dr 1st Fl Rec F, Mott HospitalAnn Arbor, MI 48109 (734) 764‑5176
- 1500 E Medical Ctr Dr 1st Floor, Taubman CenterAnn Arbor, MI 48108 (734) 936‑9010
Group practices
Medicare enrollment lists Mark D. Garwood as a member of this group (CMS data updated October 2, 2026).
- Regents of the University of Michigan3,346 clinicians in the group
Specialties
- Sleep Medicineprimary
- Neurologyalso
Other sleep medicine doctors in Ann Arbor
Clinicians with the same Medicare primary specialty in Ann Arbor, MI — not a recommendation.
Other clinicians in Regents of the University of Michigan
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Loyola University Of Chicago, Stritch School Of Medicine |
| Graduation year | 2001 (25 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1144231077 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians