Alexander Charles Greff, PA-C
- Medicare patients, 2024
- 91
- Part D claims, 2024
- 441
- Industry payments
- $393
- Affiliated sites
- 2
- Medical groups
- 2
- Practice address
- 325 Tamarack Ln, O'Fallon, IL 62269
- Practice phone
- Call (618) 624-2060
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Allergy, Asthma & Immunology Center SC
O'Fallon, Illinois
Find Alexander Greff'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.
Alexander Charles Greff is a physician assistant in O'Fallon, Illinois
Alexander Greff practices at Allergy, Asthma & Immunology Center SC in O'Fallon, Illinois.
Alexander Greff's NPI, 1578182564, was assigned on April 10, 2020.
- NPI
- 1578182564NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4981010162
- NPI enumeration date
- April 10, 2020
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (618) 624-2060
- 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 Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Alexander Charles Greff practices at Allergy, Asthma & Immunology Center SC in O'Fallon, Illinois
Alexander Greff's primary practice is Allergy, Asthma & Immunology Center SC, at 325 Tamarack Ln, O'Fallon, IL 62269 in Saint Clair County. The practice phone is (618) 624-2060.
- Allergy, Asthma & Immunology Center SC325 Tamarack Ln, O'Fallon, IL 62269 · Saint Clair CountyPhone(618) 624-2060
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Alexander Charles Greff is affiliated with 3 sites of care and 2 medical groups
Alexander Greff's primary practice is Allergy, Asthma & Immunology Center SC in O'Fallon, Illinois. The medical group on file is Esse Health. Dmand AI also links Alexander Greff to 2 more group practices and clinics and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Alexander Charles Greff's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Alexander Greff practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Allergy, Asthma & Immunology Center SC | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Alexander Charles Greff is one of 4,299 physician assistants in Illinois
Physician assistant is Alexander Greff's primary specialty in the NPI Registry, under taxonomy code 363A00000X. Alexander Greff has a license on file in Illinois.
Specialties and state licenses
- Illinois license
Physician assistants near Alexander Greff
Counts of physician assistants 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
Alexander Charles Greff treated 91 Medicare patients in 2024, average age 69
CMS counts 91 Medicare patients who saw Alexander Greff in 2024. The largest group is 65 to 74, with 61 patients. 75% of them have high cholesterol, and 74% have high blood pressure. Their average risk score is 1.13, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Alexander Greff's median patient age at 40, with 67% women.
Alexander Greff's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Alexander Greff's Medicare patients by sex, 2024
- Women7279%
- Men1921%
Chronic conditions among Alexander Greff's Medicare patients, 2024
- High cholesterol75%
- High blood pressure74%
- Arthritis53%
- Asthma38%
- COPD31%
- Anxiety30%
- Diabetes24%
- Ischemic heart disease20%
Share of Medicare patients with each condition. A patient can have several.
Alexander Greff's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 40
Patient panel by sex, all payers
- Women67%
- Men32%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Alexander Charles Greff wrote 441 Medicare Part D claims in 2024
In 2024, Alexander Greff wrote 441 Medicare Part D claims for 92 patients. 64% of them were for generic drugs.
Alexander Greff's Part D claims by kind of drug, 2024
- Generic284 claims64%
- Brand-name157 claims36%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Alexander Charles Greff takes part in Medicare
Alexander Greff 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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Alexander Charles Greff received $393 in industry payments in 2025
CMS Open Payments shows 20 general payments to Alexander Greff from 9 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. Takeda Pharmaceuticals U.S.A., Inc. paid the most, $127.
Companies that paid Alexander Greff the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Alexander Charles Greff'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| 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 (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 Alexander Charles Greff
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Alexander Charles Greff's NPI number?
Alexander Charles Greff's NPI number is 1578182564. It was assigned on April 10, 2020, and it is active in the NPI Registry.
What does Alexander Charles Greff specialize in?
Alexander Charles Greff is a physician assistant in O'Fallon, Illinois. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does Alexander Charles Greff practice?
Alexander Greff practices at 325 Tamarack Ln, O'Fallon, IL 62269. Alexander Greff's primary practice is Allergy, Asthma & Immunology Center SC in O'Fallon, Illinois. Dmand AI also links Alexander Greff to 2 group practices and clinics and 1 medical group.
What is Alexander Charles Greff's office phone number?
The practice phone on file for Alexander Greff is (618) 624-2060.
What medical group is Alexander Charles Greff part of?
Alexander Greff is linked to Esse Health. Dmand AI links Alexander Greff to 1 more medical group.
Does Alexander Charles Greff accept Medicare?
Yes. CMS lists Alexander Greff as accepting Medicare assignment.
How many Medicare patients does Alexander Charles Greff see?
CMS counts 91 Medicare patients who saw Alexander Greff in 2024, with an average age of 69.
Has Alexander Charles Greff received payments from drug or device companies?
CMS Open Payments shows $393 in general payments to Alexander Greff from 9 companies from 2025 to 2025. The largest total came from Takeda Pharmaceuticals U.S.A., Inc.
How long has Alexander Charles Greff been practicing?
Alexander Greff graduated from medical school in 2020, 6 years ago.
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