Dr. Collin Martin Greer, MD
- Medicare services, 2024
- 127
- Medicare patients, 2024
- 101
- Part D claims, 2024
- 108
- Hospital affiliations
- 4
- Industry payments
- $93
- Practice address
- 800 E Carpenter St, Springfield, IL 62769
- Practice phone
- Call (217) 544-6464
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Greer's professional email, personal email and mobile number
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Dr. Collin Martin Greer is an emergency medicine physician in Springfield, Illinois
Dr. Greer practices at HSHS St. John's Hospital in Springfield, Illinois, part of Hospital Sisters of St. Francis.
Dr. Greer's NPI, 1730763657, was assigned on May 6, 2021. Dr. Greer holds Illinois license 036171199.
- NPI
- 1730763657NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9638619646
- NPI enumeration date
- May 6, 2021
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (217) 544-6464
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 32
- Medical school graduation
- 2020
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Collin Martin Greer practices at HSHS St. John's Hospital in Springfield, Illinois
Dr. Greer's primary practice is HSHS St. John's Hospital, at 800 E Carpenter St, Springfield, IL 62769 in Sangamon County. The practice phone is (217) 544-6464.
- HSHS St. John's Hospital800 E Carpenter St, Springfield, IL 62769 · Sangamon CountyPhone(217) 544-6464
Source: Dmand AI Affiliation Data
Dr. Collin Martin Greer is affiliated with 4 sites of care and 2 medical groups
Dr. Greer's primary practice is HSHS St. John's Hospital in Springfield, Illinois, part of Hospital Sisters of St. Francis. Dr. Greer is also affiliated with OSF Saint Anthony Medical Center. The medical group on file is CEP America. Dmand AI also links Dr. Greer to 2 more hospitals and 1 medical group, 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. Collin Martin Greer's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Greer practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| HSHS St. John's Hospital | Available with a free account |
| +3 more sites and 1 medical group | 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 Hospital Sisters of St. Francis and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Collin Martin Greer is one of 2,385 emergency medicine physicians in Illinois
Emergency medicine is Dr. Greer's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Greer is licensed in Illinois.
Specialties and state licenses
- Emergency medicine, IllinoisPrimary
Emergency medicine physicians near Dr. Greer
Counts of emergency 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. Collin Martin Greer billed Medicare for 127 services in 2024
CMS data shows 127 Medicare services from Dr. Greer across 4 procedure codes in 2024, for 101 Medicare patients. Medicare paid $14,451 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Greer's Medicare services by type, 2024
- Office and hospital visits105
- Tests and treatments22
Dr. Greer compared with the Illinois median for emergency medicine physicians, 2024
- Dr. Greer
- Illinois median
- Medicare services
- 127vs 27454% below
- Medicare patients
- 101vs 27363% below
- Part D claims
- 19vs 4558% below
Medians across 2,281 emergency medicine physicians in Illinois with Dmand AI profiles that report each measure.
Dr. Greer's most billed Medicare procedure codes, 2024
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. Greer and other emergency medicine physicians in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Collin Martin Greer treated 101 Medicare patients in 2024, average age 72
CMS counts 101 Medicare patients who saw Dr. Greer in 2024. The largest group is 65 to 74, with 37 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 19% are also on Medicaid. Their average risk score is 1.87, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Greer's median patient age at 66, with 55% women.
Dr. Greer's Medicare patients by age, 2024
Dr. Greer's Medicare patients by sex, 2024
- Women6463%
- Men3737%
Chronic conditions among Dr. Greer's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis52%
- Heart failure41%
- Chronic kidney disease38%
- Mood disorders37%
- Anxiety36%
- Ischemic heart disease36%
Share of Medicare patients with each condition. A patient can have several.
Dr. Greer's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 66
Patient panel by sex, all payers
- Women55%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Collin Martin Greer wrote 108 Medicare Part D claims in 2024
In 2024, Dr. Greer wrote 108 Medicare Part D claims for 84 patients. 97% of them were for generic drugs. CMS names the drug for 19 of them, across 1 drug with 11 or more claims each, at $85 in total drug cost.
Dr. Greer's Part D claims by kind of drug, 2024
- Generic105 claims97%
- Brand-name and other3 claims3%
Dr. Greer'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. Greer's Part D claims, 2024
- Antibiotics34%37 of 108 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
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. Collin Martin Greer takes part in Medicare
Dr. Greer 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. Collin Martin Greer received $93 in industry payments in 2024
CMS Open Payments shows 1 general payment to Dr. Greer from 1 drug or device company in 2024. Food and beverage make up the largest share, 100% of the total. Lightbody Medical Technologies Inc paid the most, $93.
Companies that paid Dr. Greer the most, 2024 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Collin Martin Greer'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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| 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) |
| 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. Collin Martin Greer
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. Collin Martin Greer's NPI number?
Dr. Collin Martin Greer's NPI number is 1730763657. It was assigned on May 6, 2021, and it is active in the NPI Registry.
What kind of doctor is Dr. Collin Martin Greer?
Dr. Collin Martin Greer is an emergency medicine physician in Springfield, Illinois. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Collin Martin Greer practice?
Dr. Greer practices at 800 E Carpenter St, Springfield, IL 62769. Dr. Greer's primary practice is HSHS St. John's Hospital in Springfield, Illinois, part of Hospital Sisters of St. Francis. Dmand AI also links Dr. Greer to 2 hospitals and 1 medical group.
What is Dr. Collin Martin Greer's office phone number?
The practice phone on file for Dr. Greer is (217) 544-6464.
What is Dr. Collin Martin Greer's medical license number?
Dr. Greer holds Illinois license 036171199.
Which hospitals is Dr. Collin Martin Greer affiliated with?
Dr. Greer practices at HSHS St. John's Hospital in Springfield, Illinois. Dr. Greer is also affiliated with OSF Saint Anthony Medical Center. Dmand AI links Dr. Greer to 2 more hospitals.
What medical group is Dr. Collin Martin Greer part of?
Dr. Greer is linked to CEP America. Dmand AI links Dr. Greer to 1 more medical group.
Does Dr. Collin Martin Greer accept Medicare?
Yes. CMS data shows Dr. Greer billed Medicare for 127 services in 2024, and Dr. Greer accepts Medicare assignment.
How many Medicare patients does Dr. Collin Martin Greer see?
CMS counts 101 Medicare patients who saw Dr. Greer in 2024, with an average age of 72.
What services does Dr. Collin Martin Greer bill to Medicare?
In 2024, Dr. Greer's most billed Medicare services were emergency department visit (99285), heart test or procedure (93010) and critical care (99291).
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What drugs does Dr. Collin Martin Greer prescribe most?
In 2024 Medicare Part D data, Dr. Greer's most prescribed drugs by claims were Cephalexin.
Has Dr. Collin Martin Greer received payments from drug or device companies?
CMS Open Payments shows $93 in general payments to Dr. Greer from 1 company from 2024 to 2024. The largest total came from Lightbody Medical Technologies Inc.
How long has Dr. Collin Martin Greer been practicing?
Dr. Greer graduated from medical school in 2020, 6 years ago.
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