Maggie Gierahn
- Part D claims, 2024
- 145
- Hospital affiliations
- 4
- Industry payments
- $18
- Medical groups
- 3
- State license
- 1
- Practice address
- 2311 N Prospect Ave, Milwaukee, WI 53211
- Practice phone
- Call (414) 585-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Ascension Columbia St Mary's Hospital Milwaukee
Milwaukee, Wisconsin
Find Maggie Gierahn'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.
Maggie Gierahn is a physician assistant in Milwaukee, Wisconsin
Maggie Gierahn practices at Ascension Columbia St Mary's Hospital Milwaukee in Milwaukee, Wisconsin.
Maggie Gierahn's NPI, 1447746896, was assigned on July 9, 2018. Maggie Gierahn holds Wisconsin license 4395.
- NPI
- 1447746896NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2961751623
- NPI enumeration date
- July 9, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (414) 585-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Maggie Gierahn practices at Ascension Columbia St Mary's Hospital Milwaukee in Milwaukee, Wisconsin
Maggie Gierahn's primary practice is Ascension Columbia St Mary's Hospital Milwaukee, at 2311 N Prospect Ave, Milwaukee, WI 53211 in Milwaukee County. The practice phone is (414) 585-1000.
- Ascension Columbia St Mary's Hospital Milwaukee2311 N Prospect Ave, Milwaukee, WI 53211 · Milwaukee CountyPhone(414) 585-1000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Maggie Gierahn is affiliated with 7 sites of care and 3 medical groups
Maggie Gierahn's primary practice is Ascension Columbia St Mary's Hospital Milwaukee in Milwaukee, Wisconsin. Maggie Gierahn is also affiliated with Ascension SE Wisconsin Hospital - St. Joseph. The medical group on file is Ascension Medical Group. Dmand AI also links Maggie Gierahn to 3 more hospitals, 2 group practices and clinics and 2 medical groups, 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 Maggie Gierahn's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Maggie Gierahn practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Ascension Columbia St Mary's Hospital Milwaukee | Available with a free account |
| +6 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Maggie Gierahn is one of 3,127 physician assistants in Wisconsin
Physician assistant is Maggie Gierahn's primary specialty in the NPI Registry, under taxonomy code 363A00000X. Maggie Gierahn is licensed in Wisconsin.
Specialties and state licenses
- Physician assistant, WisconsinPrimary
Physician assistants near Maggie Gierahn
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
Maggie Gierahn's patients have a median age of 72
Across all payers, Dmand AI patient panel data puts Maggie Gierahn's median patient age at 72, with 44% women.
Maggie Gierahn's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women44%
- Men56%
Source: Dmand AI Patient Panel Data
Maggie Gierahn wrote 145 Medicare Part D claims in 2024
In 2024, Maggie Gierahn wrote 145 Medicare Part D claims for 43 patients. 86% of them were for generic drugs.
Maggie Gierahn's Part D claims by kind of drug, 2024
- Generic124 claims86%
- Brand-name21 claims14%
Drug classes CMS tracks in Maggie Gierahn's Part D claims, 2024
- Opioids11%16 of 145 claims
- Antibiotics17%24 of 145 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Maggie Gierahn takes part in Medicare
Maggie Gierahn 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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Maggie Gierahn received $18 in industry payments in 2025
CMS Open Payments shows 1 general payment to Maggie Gierahn from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Histosonics, Inc. paid the most, $18.
Companies that paid Maggie Gierahn 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 Maggie Gierahn'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 Data |
| 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 Maggie Gierahn
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Maggie Gierahn's NPI number?
Maggie Gierahn's NPI number is 1447746896. It was assigned on July 9, 2018, and it is active in the NPI Registry.
What does Maggie Gierahn specialize in?
Maggie Gierahn is a physician assistant in Milwaukee, Wisconsin. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does Maggie Gierahn practice?
Maggie Gierahn practices at 2311 N Prospect Ave, Milwaukee, WI 53211. Maggie Gierahn's primary practice is Ascension Columbia St Mary's Hospital Milwaukee in Milwaukee, Wisconsin. Dmand AI also links Maggie Gierahn to 3 hospitals, 2 group practices and clinics and 2 medical groups.
What is Maggie Gierahn's office phone number?
The practice phone on file for Maggie Gierahn is (414) 585-1000.
What is Maggie Gierahn's medical license number?
Maggie Gierahn holds Wisconsin license 4395.
Which hospitals is Maggie Gierahn affiliated with?
Maggie Gierahn is affiliated with Ascension SE Wisconsin Hospital - St. Joseph. Dmand AI links Maggie Gierahn to 3 more hospitals.
What medical group is Maggie Gierahn part of?
Maggie Gierahn is linked to Ascension Medical Group. Dmand AI links Maggie Gierahn to 2 more medical groups.
Does Maggie Gierahn accept Medicare?
Yes. CMS lists Maggie Gierahn as accepting Medicare assignment.
Has Maggie Gierahn received payments from drug or device companies?
CMS Open Payments shows $18 in general payments to Maggie Gierahn from 1 company from 2025 to 2025. The largest total came from Histosonics, Inc.
How long has Maggie Gierahn been practicing?
Maggie Gierahn graduated from medical school in 2018, 8 years ago.
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