Dr. Michael Joseph Greiner, MD
- Medicare services, 2022
- 20
- Part D claims, 2024
- 8,347
- Hospital affiliations
- 1
- Industry payments
- $98
- Medical group
- 1
- Practice address
- 2000 S Main, Fairfield, IA 52556
- Practice phone
- Call (641) 472-4111
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Michael Joseph Greiner is a family medicine physician in Fairfield, Iowa
Dr. Greiner practices at Jefferson County Health Center in Fairfield, Iowa, part of Jefferson County Health Center.
Dr. Greiner's NPI, 1124133640, was assigned on August 21, 2006. Dr. Greiner graduated from University of Iowa, RJ & L Carver College of Medicine in 1987. Dr. Greiner holds Iowa license 26708.
- NPI
- 1124133640NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6608839147
- NPI enumeration date
- August 21, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (641) 472-4111
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 65
- Medical school graduation
- 1987
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Michael Joseph Greiner practices at Jefferson County Health Center in Fairfield, Iowa
Dr. Greiner's primary practice is Jefferson County Health Center, at 2000 S Main, Fairfield, IA 52556 in Jefferson County. The practice phone is (641) 472-4111.
- Jefferson County Health Center2000 S Main, Fairfield, IA 52556 · Jefferson CountyPhone(641) 472-4111
Source: Dmand AI Affiliation Data
Dr. Michael Joseph Greiner is affiliated with 3 sites of care and 1 medical group
Dr. Greiner's primary practice is Jefferson County Health Center in Fairfield, Iowa, part of Jefferson County Health Center. The medical group on file is Jefferson County Health Center. Dmand AI also links Dr. Greiner to 1 more hospital outpatient department and 1 skilled nursing facility, each 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 Joseph Greiner's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Greiner practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Jefferson County Health Center | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Jefferson County Health Center and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Michael Joseph Greiner is one of 1,873 family medicine physicians in Iowa
Family medicine is Dr. Greiner's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Greiner is board certified in family medicine by the American Board of Family Medicine. Dr. Greiner is licensed in Iowa.
Specialties and state licenses
- Family medicine, IowaPrimary
Family medicine physicians near Dr. Greiner
Counts of family medicine physicians 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 Joseph Greiner billed Medicare for 20 services in 2022
CMS data shows 20 Medicare services from Dr. Greiner across 1 procedure code in 2022. Medicare paid $119 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Greiner's Medicare services by type, 2021 to 2022
- 2021
- 2022
- Tests and treatments
- 2021: 192022: 205%
Dr. Greiner compared with the Iowa median for family medicine physicians, 2022
- Dr. Greiner
- Iowa median
- Medicare services
- 20vs 35994% below
- Part D claims
- 7,606vs 1,1386.7 times
Medians across 1,982 family medicine physicians in Iowa with Dmand AI profiles that report each measure.
Dr. Greiner's most billed Medicare procedure codes, 2022
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. Greiner and other family medicine physicians in Iowa.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Michael Joseph Greiner's patients have a median age of 75
Across all payers, Dmand AI patient panel data puts Dr. Greiner's median patient age at 75, with 50% women.
Dr. Greiner's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 75
Patient panel by sex, all payers
- Women50%
- Men50%
Source: Dmand AI Patient Panel Data
Dr. Michael Joseph Greiner wrote 8,347 Medicare Part D claims in 2024
In 2024, Dr. Greiner wrote 8,347 Medicare Part D claims for 598 patients. 90% of them were for generic drugs. CMS names the drug for 7,606 of them, across 134 drugs with 11 or more claims each, at $366,443 in total drug cost. In 2023, CMS named 9,330 claims across 150 drugs.
Dr. Greiner's Part D claims by kind of drug, 2024
- Generic7,538 claims90%
- Brand-name741 claims9%
- Other68 claims1%
Dr. Greiner's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Greiner's Part D claims, 2024
- Opioids2%190 of 8,347 claims
- Antibiotics1%118 of 8,347 claims
- Antipsychotics, patients 65 and over1%70 of 8,347 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 9,3302024: 7,60618%
Drugs named by CMS: 134 in 2024, 150 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Michael Joseph Greiner takes part in Medicare
Dr. Greiner accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Michael Joseph Greiner received $98 in industry payments in 2024
CMS Open Payments shows 2 general payments to Dr. Greiner from 1 drug or device company in 2024. Food and beverage make up the largest share, 100% of the total. Nevro Corp. paid the most, $98.
Companies that paid Dr. Greiner the most, 2024 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Michael Joseph Greiner graduated from University of Iowa, RJ & L Carver College of Medicine
Dr. Greiner graduated from University of Iowa, RJ & L Carver College of Medicine in 1987.
- Medical school
- Board certified in family medicine
Source: Dmand AI Professional Profile Data
Sources for Dr. Michael Joseph Greiner'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)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| 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 Joseph Greiner
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 Joseph Greiner's NPI number?
Dr. Michael Joseph Greiner's NPI number is 1124133640. It was assigned on August 21, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael Joseph Greiner?
Dr. Michael Joseph Greiner is a family medicine physician in Fairfield, Iowa. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. Michael Joseph Greiner practice?
Dr. Greiner practices at 2000 S Main, Fairfield, IA 52556. Dr. Greiner's primary practice is Jefferson County Health Center in Fairfield, Iowa, part of Jefferson County Health Center. Dmand AI also links Dr. Greiner to 1 hospital outpatient department and 1 skilled nursing facility.
What is Dr. Michael Joseph Greiner's office phone number?
The practice phone on file for Dr. Greiner is (641) 472-4111.
What is Dr. Michael Joseph Greiner's medical license number?
Dr. Greiner holds Iowa license 26708.
Which hospitals is Dr. Michael Joseph Greiner affiliated with?
Dr. Greiner practices at Jefferson County Health Center in Fairfield, Iowa.
What medical group is Dr. Michael Joseph Greiner part of?
Dr. Greiner is linked to Jefferson County Health Center.
Does Dr. Michael Joseph Greiner accept Medicare?
Yes. CMS data shows Dr. Greiner billed Medicare for 20 services in 2022, and Dr. Greiner accepts Medicare assignment.
Is Dr. Michael Joseph Greiner board certified?
Yes. Dr. Greiner is board certified in family medicine by the American Board of Family Medicine.
What services does Dr. Michael Joseph Greiner bill to Medicare?
In 2022, Dr. Greiner's most billed Medicare services were heart test or procedure (93010).
Show 4 more questionsShow fewer questions
Where did Dr. Michael Joseph Greiner go to medical school?
Dr. Greiner graduated from University of Iowa, RJ & L Carver College of Medicine in 1987.
What drugs does Dr. Michael Joseph Greiner prescribe most?
In 2024 Medicare Part D data, Dr. Greiner's most prescribed drugs by claims were Atorvastatin Calcium, Lisinopril and Losartan Potassium.
Has Dr. Michael Joseph Greiner received payments from drug or device companies?
CMS Open Payments shows $98 in general payments to Dr. Greiner from 1 company from 2024 to 2024. The largest total came from Nevro Corp.
How long has Dr. Michael Joseph Greiner been practicing?
Dr. Greiner graduated from medical school in 1987, 39 years ago.
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