Dr. Michael S. Greiner , NP-C, DC
Nurse Practitioner • Warren, MI
2243 E 12 Mile Rd
Warren, MI 480925644
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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Dr. Michael Greiner is listed in NPPES under Nurse Practitioner.
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NPI assigned on October 15, 2008; this date does not establish years in practice.
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Published CMS data list 48 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 98941 — Chiropractic manipulative treatment, 3-4 spinal regions: 48 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See the full table · Guide: How to read Medicare Part B data
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Published CMS data list 596 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Tizanidine Hcl — 95 prescription fills, including refills.
- Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) — 92 prescription fills, including refills.
- Oxycodone-Acetaminophen (Oxycodone Hcl/Acetaminophen) — 83 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 14 records in the table · Guide: How to read Medicare Part D prescriber data
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Fewer Medicare Part B services than 95% of clinicians listed under Nurse Practitioner in Warren, MI (2024, 12 clinicians with data). Median for this group: 463. Middle half: 118 to 898.
Fewer Medicare Part B services than 80% of clinicians listed under Nurse Practitioner in Michigan (2024, 1,372 clinicians with data). Median for this group: 167. Middle half: 69 to 368.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 872 in 2020 to 48 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
2243 E 12 Mile Rd
Warren, MI 480925644
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Medcare Inc. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
2023
What Public CMS Data Show
Nurse Practitioner: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
32 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $1,806 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
Paid by Medicare
About $1,368 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
30-day fills
613 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$8,184 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $731.43 across 17 records.
By nature of payment
- Food and Beverage: $731.43 across 17 records.
Reporting-company totals (3 largest of 7)
- Saluda Medical Americas, Inc.: $470.25 across 8 records.
- SPR Therapeutics, Inc: $102.58 across 1 record.
- Ferring Pharmaceuticals Inc.: $72.53 across 4 records.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
Years since graduation
3 years (graduated 2023)
CMS Doctors and Clinicians data list 2023 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2008
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Greiner has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Greiner as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Warren and Michigan
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Fewer Medicare Part B services than 95% of clinicians listed under Nurse Practitioner in Warren, MI (2024, 12 clinicians with data). Median for this group: 463. Middle half: 118 to 898.
Fewer Medicare Part B services than 80% of clinicians listed under Nurse Practitioner in Michigan (2024, 1,372 clinicians with data). Median for this group: 167. Middle half: 69 to 368.
Medicare-allowed amount
A lower Medicare-allowed amount than 95% of clinicians listed under Nurse Practitioner in Warren, MI (2024, 12 clinicians with data). Median for this group: $23,744. Middle half: $11,498 to $46,023.
A lower Medicare-allowed amount than 90% of clinicians listed under Nurse Practitioner in Michigan (2024, 1,372 clinicians with data). Median for this group: $13,264. Middle half: $5,488 to $26,831.
Paid by Medicare
A lower Medicare payment amount than 95% of clinicians listed under Nurse Practitioner in Warren, MI (2024, 12 clinicians with data). Median for this group: $17,357. Middle half: $8,923 to $33,659.
A lower Medicare payment amount than 90% of clinicians listed under Nurse Practitioner in Michigan (2024, 1,372 clinicians with data). Median for this group: $9,814. Middle half: $4,035 to $19,683.
Medicare Part D prescriptions
More Part D prescriptions than 60% of clinicians listed under Nurse Practitioner in Warren, MI (2024, 15 clinicians with data). Median for this group: 471. Middle half: 189 to 688.
Close to the middle for clinicians listed under Nurse Practitioner in Michigan (2024, 1,581 clinicians with data). Median for this group: 360. Middle half: 97 to 1,478.
Part D drug cost
Close to the middle for clinicians listed under Nurse Practitioner in Warren, MI (2024, 15 clinicians with data). Median for this group: $9,509. Middle half: $1,591 to $131,552.
A lower Part D drug cost than 60% of clinicians listed under Nurse Practitioner in Michigan (2024, 1,581 clinicians with data). Median for this group: $24,697. Middle half: $1,472 to $176,540.
29 active clinicians are listed under Nurse Practitioner with a practice address in Warren, MI (3,576 in Michigan).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Warren
3.4% of these 29 clinicians have the CMS telehealth indicator.
58.6% of these 29 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services decreased 94% from 872 in 2020 to 48 in 2024.
- 2020: 872
- 2021: 1,129
- 2022: 382
- 2023: 259
- 2024: 48
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Medicare-allowed amount
Medicare-allowed amount decreased 95% from $34,494 in 2020 to $1,806 in 2024.
- 2020: $34,494
- 2021: $45,419
- 2022: $14,205
- 2023: $10,228
- 2024: $1,806
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Paid by Medicare
Paid by Medicare decreased 95% from $25,667 in 2020 to $1,368 in 2024.
- 2020: $25,667
- 2021: $35,100
- 2022: $10,035
- 2023: $7,635
- 2024: $1,368
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 389% from 122 in 2023 to 596 in 2024.
- 2023: 122
- 2024: 596
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30-day fills
30-day fills increased 394% from 124 in 2023 to 613 in 2024.
- 2023: 124
- 2024: 613
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Part D drug cost
Part D drug cost increased 281% from $2,149 in 2023 to $8,184 in 2024.
- 2023: $2,149
- 2024: $8,184
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $180.45 in 2024 to $731.43 in 2025.
- 2024: $180.45
- 2025: $731.43
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 – December 31, 2025): 17 records totaling $731.43.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| SPR Therapeutics, Inc |
Food and Beverage
Cash or cash equivalent
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SPRINT PNS System | General | $102.58 |
| Saluda Medical Americas, Inc. |
Food and Beverage
In-kind items and services
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Evoke | General | $89.30 |
| Saluda Medical Americas, Inc. |
Food and Beverage
In-kind items and services
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Evoke | General | $87.72 |
| Saluda Medical Americas, Inc. |
Food and Beverage
In-kind items and services
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Evoke | General | $86.44 |
| Saluda Medical Americas, Inc. |
Food and Beverage
In-kind items and services
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Evoke | General | $83.83 |
| Saluda Medical Americas, Inc. |
Food and Beverage
In-kind items and services
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Evoke | General | $63.62 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
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UBRELVY | General | $25.31 |
| Saluda Medical Americas, Inc. |
Food and Beverage
In-kind items and services
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Evoke | General | $23.56 |
| Saluda Medical Americas, Inc. |
Food and Beverage
In-kind items and services
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Evoke | General | $22.59 |
| SI-BONE, INC. |
Food and Beverage
Cash or cash equivalent
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— | General | $21.48 |
| VERTEX PHARMACEUTICALS INCORPORATED |
Food and Beverage
In-kind items and services
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JOURNAVX | General | $20.69 |
| Medtronic, Inc. |
Food and Beverage
In-kind items and services
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INCEPTIV | General | $18.59 |
| Ferring Pharmaceuticals Inc. |
Food and Beverage
In-kind items and services
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EUFLEXXA | General | $18.53 |
| Ferring Pharmaceuticals Inc. |
Food and Beverage
In-kind items and services
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EUFLEXXA | General | $18.50 |
| Ferring Pharmaceuticals Inc. |
Food and Beverage
In-kind items and services
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EUFLEXXA | General | $17.96 |
| Ferring Pharmaceuticals Inc. |
Food and Beverage
In-kind items and services
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EUFLEXXA | General | $17.54 |
| Saluda Medical Americas, Inc. |
Food and Beverage
In-kind items and services
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Evoke | General | $13.19 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners – by Provider and Service data, 2017–2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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98941
Chiropractic manipulative treatment, 3-4 spinal regions
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48 | 22 | $117.34 | $37.62 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Tizanidine Hcl | Tizanidine Hcl | 95 | 2,989 | $790.49 | 57 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 92 | 2,519 | $1,868.35 | 55 |
| Oxycodone-Acetaminophen | Oxycodone Hcl/Acetaminophen | 83 | 2,323 | $1,990.87 | 40 |
| Diclofenac Sodium | Diclofenac Sodium | 64 | 1,859 | $764.50 | 41 |
| Gabapentin | Gabapentin | 60 | 2,021 | $575.76 | 30 |
| Cyclobenzaprine Hcl | Cyclobenzaprine Hcl | 43 | 1,258 | $280.96 | 27 |
| Ibuprofen | Ibuprofen | 30 | 880 | $135.61 | 15 |
| Oxycodone Hcl | Oxycodone Hcl | 27 | 810 | $586.21 | 11 |
| Meloxicam | Meloxicam | 25 | 761 | $80.07 | 14 |
| Acetaminophen-Codeine | Acetaminophen With Codeine | 24 | 510 | $433.98 | 11 |
| Alprazolam | Alprazolam | 17 | 425 | $64.72 | — |
| Tramadol Hcl | Tramadol Hcl | 13 | 367 | $77.93 | — |
| Pregabalin | Pregabalin | 12 | 360 | $479.26 | — |
| Carisoprodol | Carisoprodol | 11 | 330 | $55.46 | — |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2024-09-12NUCC Taxonomy Code: 363L00000X
(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.
NUCC Taxonomy Code: 111N00000X
A provider qualified by a Doctor of Chiropractic (D.C.), licensed by the State and who practices chiropractic medicine -that discipline within the healing arts which deals with the nervous system and its relationship to the spinal column and its interrelationship with other body systems.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - NURSE PRACTITIONER
I20250602003471
MI
9931263670
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Medcare Inc
2243 E 12 Mile Rd, Warren, MI 480925644
Phone: 5865738100
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Physical Medicine & Rehabilitation
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 2243 E 12 MILE RD, WARREN, MI 480925644 (Tel: 5865738100)
Registered at 2243 E 12 MILE RD, WARREN, MI 480925644 (Tel: 5865738100)
Recorded as MICHAEL GREINER, NP-C, D.C.
Chiropractor (license number reported to NPPES: MI MG009739)
NPI status registered as active in NPPES database
Registered at 520 N PROSPECT AVE, STE # 201, REDONDO BEACH, CA 902773041 (Tel: 3103749710)
Registered at 1424 MANHATTAN AVE APT 3, HERMOSA BEACH, CA 902543600 (Tel: 5862430303)
Recorded as MICHAEL GREINER, D.C.
Chiropractor (license number reported to NPPES: CA 31035)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Nurse Practitioners in Warren
- Jennifer Patton, FNP-C
- Laurie Merkel, NURSE PRACTITIONER
- Jennifer Meitzner, NP-C
- Josef Kotermanski, NP-C
- Mai Xiong, NP-C
- June Argel, NURSE PRACTITIONER
Mailing Address
2243 E 12 Mile Rd
Warren, MI 480925644
Phone: 5865738100