Dr. Michael Anthony Grefer, MD
- Medicare services, 2020
- 135
- Part D claims, 2020
- 278
- Hospital affiliations
- 1
- State license
- 1
- Year NPI issued
- 2005
- Practice address
- 715 Richland Mall, Ontario, OH 44906
- Practice phone
- Call (419) 462-4534
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Grefer's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Michael Anthony Grefer is an orthopedic surgeon in Mansfield, Ohio
Dr. Grefer practices at Ontario Hospital in Ontario, Ohio, part of Avita Health System.
Dr. Grefer's NPI, 1881699692, was assigned on June 17, 2005. Dr. Grefer holds Kentucky license 18854.
- NPI
- 1881699692NPI Registry (opens in a new tab)
- NPI enumeration date
- June 17, 2005
- NPI status
- Active
- Practice phone
- (419) 462-4534
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Michael Anthony Grefer practices at Ontario Hospital in Ontario, Ohio
Dr. Grefer's primary practice is Ontario Hospital, at 715 Richland Mall, Ontario, OH 44906 in Richland County. The practice phone is (419) 462-4534.
- Ontario Hospital715 Richland Mall, Ontario, OH 44906 · Richland CountyPhone(419) 462-4534
Source: Dmand AI Affiliation Data
Dr. Michael Anthony Grefer is affiliated with 2 sites of care
Dr. Grefer's primary practice is Ontario Hospital in Ontario, Ohio, part of Avita Health System. Dmand AI also links Dr. Grefer to 1 ambulatory surgery center, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Michael Anthony Grefer's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Grefer practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Ontario Hospital | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dmand AI maps EHR vendors, IT decision makers and buying committees across Avita Health System and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Michael Anthony Grefer is one of 828 orthopedic surgeons in Ohio
Orthopaedic surgery is Dr. Grefer's primary specialty in the NPI Registry, under taxonomy code 207X00000X. Dr. Grefer is licensed in Kentucky.
Specialties and state licenses
- Orthopaedic surgery, KentuckyPrimary
Orthopedic surgeons near Dr. Grefer
Counts of orthopedic surgeons with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Michael Anthony Grefer billed Medicare for 135 services in 2020
CMS data shows 135 Medicare services from Dr. Grefer across 3 procedure codes in 2020, all of them office visits. Medicare paid $4,731 for them. Every service was in an office.
Dr. Grefer's Medicare services by type, 2019 to 2020
- 2019
- 2020
- Office and hospital visits
- 2019: 7122020: 13581%
- Drugs given in the office
- 2019: 432020: 0100%
- Imaging
- 2019: 1172020: 0100%
- Surgery
- 2019: 222020: 0100%
Dr. Grefer compared with the Ohio median for orthopedic surgeons, 2020
- Dr. Grefer
- Ohio median
- Medicare services
- 135vs 80483% below
- Part D claims
- 278vs 1232.3 times
Medians across 822 orthopedic surgeons in Ohio with Dmand AI profiles that report each measure.
Dr. Grefer's most billed Medicare procedure codes, 2020
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Grefer and other orthopedic surgeons in Ohio.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Michael Anthony Grefer's patients have a median age of 65
Across all payers, Dmand AI patient panel data puts Dr. Grefer's median patient age at 65, with 45% women.
Dr. Grefer's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women45%
- Men55%
Source: Dmand AI Patient Panel Data
Dr. Michael Anthony Grefer wrote 278 Medicare Part D claims in 2020
In 2020, Dr. Grefer wrote 278 Medicare Part D claims. Every claim was for a generic drug. They cover 8 drugs, with $3,481 in total drug cost. In 2019, CMS named 681 claims across 13 drugs.
Dr. Grefer's most prescribed drugs by claims, 2020
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2019 to 2020
- 2019
- 2020
- Claims for drugs CMS names
- 2019: 6812020: 27859%
Drugs named by CMS: 8 in 2020, 13 in 2019.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Sources for Dr. Michael Anthony Grefer's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Michael Anthony Grefer
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Michael Anthony Grefer's NPI number?
Dr. Michael Anthony Grefer's NPI number is 1881699692. It was assigned on June 17, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael Anthony Grefer?
Dr. Michael Anthony Grefer is an orthopedic surgeon in Mansfield, Ohio. The primary specialty in the NPI Registry is Orthopaedic Surgery Physician (taxonomy code 207X00000X).
Where does Dr. Michael Anthony Grefer practice?
Dr. Grefer practices at 715 Richland Mall, Ontario, OH 44906. Dr. Grefer's primary practice is Ontario Hospital in Ontario, Ohio, part of Avita Health System. Dmand AI also links Dr. Grefer to 1 ambulatory surgery center.
What is Dr. Michael Anthony Grefer's office phone number?
The practice phone on file for Dr. Grefer is (419) 462-4534.
What is Dr. Michael Anthony Grefer's medical license number?
Dr. Grefer holds Kentucky license 18854.
Which hospitals is Dr. Michael Anthony Grefer affiliated with?
Dr. Grefer practices at Ontario Hospital in Ontario, Ohio.
Does Dr. Michael Anthony Grefer accept Medicare?
Yes. CMS data shows Dr. Grefer billed Medicare for 135 services in 2020.
What services does Dr. Michael Anthony Grefer bill to Medicare?
In 2020, Dr. Grefer's most billed Medicare services were office visit, established patient (99213), office visit, established patient (99212) and office visit, established patient (99214).
What drugs does Dr. Michael Anthony Grefer prescribe most?
In 2020 Medicare Part D data, Dr. Grefer's most prescribed drugs by claims were Meloxicam, Baclofen and Tizanidine HCl.
How long has Dr. Michael Anthony Grefer been practicing?
Dr. Grefer's NPI was assigned in 2005.
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