Dr. Marshall A. Longnecker, MD
- Medicare services, 2024
- 11
- Medicare patients, 2024
- 117
- Hospital affiliations
- 2
- Industry payments
- $93
- Medical group
- 1
- Practice address
- 744 S Webster Ave, Green Bay, WI 54301
- Practice phone
- Call (920) 433-3500
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Marshall A. Longnecker is an anesthesiologist in Green Bay, Wisconsin
Dr. Longnecker practices at Emplify Health Green Bay Hospital in Green Bay, Wisconsin, part of Emplify Health.
Dr. Longnecker's NPI, 1225012743, was assigned on November 30, 2005. Dr. Longnecker graduated from University of Chicago, Pritzker School of Medicine in 1987. Dr. Longnecker holds Wisconsin license 33087-020.
- NPI
- 1225012743NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6002865623
- NPI enumeration date
- November 30, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (920) 433-3500
- 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. Marshall A. Longnecker practices at Emplify Health Green Bay Hospital in Green Bay, Wisconsin
Dr. Longnecker's primary practice is Emplify Health Green Bay Hospital, at 744 S Webster Ave, Green Bay, WI 54301 in Brown County. The practice phone is (920) 433-3500.
- Emplify Health Green Bay Hospital744 S Webster Ave, Green Bay, WI 54301 · Brown CountyPhone(920) 433-3500
Source: Dmand AI Affiliation Data
Dr. Marshall A. Longnecker is affiliated with 3 sites of care and 1 medical group
Dr. Longnecker's primary practice is Emplify Health Green Bay Hospital in Green Bay, Wisconsin, part of Emplify Health. The medical group on file is Bellin Anesthesia Associates. Dmand AI also links Dr. Longnecker to 1 more hospital and 1 imaging center, 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. Marshall A. Longnecker's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Longnecker practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Emplify Health Green Bay Hospital | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Marshall A. Longnecker is one of 1,001 anesthesiologists in Wisconsin
Anesthesiology is Dr. Longnecker's primary specialty in the NPI Registry, under taxonomy code 207L00000X. Dr. Longnecker is licensed in Wisconsin.
Specialties and state licenses
- Anesthesiology, WisconsinPrimary
Anesthesiologists near Dr. Longnecker
Counts of anesthesiologists 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. Marshall A. Longnecker billed Medicare for 11 services in 2024
CMS data shows 11 Medicare services from Dr. Longnecker across 1 procedure code in 2024, for 117 Medicare patients. Medicare paid $1,195 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Longnecker's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Anesthesia
- 2023: 112024: 11No change
- Surgery
- 2023: 122024: 0100%
Dr. Longnecker compared with the Wisconsin median for anesthesiologists, 2024
- Dr. Longnecker
- Wisconsin median
- Medicare services
- 11vs 4877% below
- Medicare patients
- 117vs 119Close to median
Medians across 995 anesthesiologists in Wisconsin with Dmand AI profiles that report each measure.
Dr. Longnecker'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.
Need commercial claims for Dr. Longnecker?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Longnecker and other anesthesiologists in Wisconsin.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Marshall A. Longnecker treated 117 Medicare patients in 2024, average age 73
CMS counts 117 Medicare patients who saw Dr. Longnecker in 2024. The largest group is 65 to 74, with 72 patients. 75% of them have high cholesterol, and 73% have high blood pressure. Their average risk score is 1.16, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Longnecker's median patient age at 66, with 54% women.
Dr. Longnecker's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Longnecker's Medicare patients by sex, 2024
- Women6253%
- Men5547%
Chronic conditions among Dr. Longnecker's Medicare patients, 2024
- High cholesterol75%
- High blood pressure73%
- Arthritis62%
- Ischemic heart disease36%
- Diabetes31%
- Chronic kidney disease30%
- Cancer29%
- Mood disorders27%
Share of Medicare patients with each condition. A patient can have several.
Dr. Longnecker'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
- Women54%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
How Dr. Marshall A. Longnecker takes part in Medicare
Dr. Longnecker 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. Marshall A. Longnecker received $93 in industry payments in 2018
CMS Open Payments shows 1 general payment to Dr. Longnecker from 1 drug or device company in 2018. Food and beverage make up the largest share, 100% of the total. Abiomed paid the most, $93.
Companies that paid Dr. Longnecker the most, 2018 to 2018
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Marshall A. Longnecker graduated from University of Chicago, Pritzker School of Medicine
Dr. Longnecker graduated from University of Chicago, Pritzker School of Medicine in 1987.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Marshall A. Longnecker'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) |
| 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. Marshall A. Longnecker
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. Marshall A. Longnecker's NPI number?
Dr. Marshall A. Longnecker's NPI number is 1225012743. It was assigned on November 30, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Marshall A. Longnecker?
Dr. Marshall A. Longnecker is an anesthesiologist in Green Bay, Wisconsin. The primary specialty in the NPI Registry is Anesthesiology Physician (taxonomy code 207L00000X).
Where does Dr. Marshall A. Longnecker practice?
Dr. Longnecker practices at 744 S Webster Ave, Green Bay, WI 54301. Dr. Longnecker's primary practice is Emplify Health Green Bay Hospital in Green Bay, Wisconsin, part of Emplify Health. Dmand AI also links Dr. Longnecker to 1 hospital and 1 imaging center.
What is Dr. Marshall A. Longnecker's office phone number?
The practice phone on file for Dr. Longnecker is (920) 433-3500.
What is Dr. Marshall A. Longnecker's medical license number?
Dr. Longnecker holds Wisconsin license 33087-020.
Which hospitals is Dr. Marshall A. Longnecker affiliated with?
Dr. Longnecker practices at Emplify Health Green Bay Hospital in Green Bay, Wisconsin. Dmand AI links Dr. Longnecker to 1 more hospital.
What medical group is Dr. Marshall A. Longnecker part of?
Dr. Longnecker is linked to Bellin Anesthesia Associates.
Does Dr. Marshall A. Longnecker accept Medicare?
Yes. CMS data shows Dr. Longnecker billed Medicare for 11 services in 2024, and Dr. Longnecker accepts Medicare assignment.
How many Medicare patients does Dr. Marshall A. Longnecker see?
CMS counts 117 Medicare patients who saw Dr. Longnecker in 2024, with an average age of 73.
What services does Dr. Marshall A. Longnecker bill to Medicare?
In 2024, Dr. Longnecker's most billed Medicare services were anesthesia (01402).
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Where did Dr. Marshall A. Longnecker go to medical school?
Dr. Longnecker graduated from University of Chicago, Pritzker School of Medicine in 1987.
Has Dr. Marshall A. Longnecker received payments from drug or device companies?
CMS Open Payments shows $93 in general payments to Dr. Longnecker from 1 company from 2018 to 2018. The largest total came from Abiomed.
How long has Dr. Marshall A. Longnecker been practicing?
Dr. Longnecker graduated from medical school in 1987, 39 years ago.
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