Dr. Spencer Wolf Greaves, MD
- Medicare services, 2024
- 31
- Medicare patients, 2024
- 38
- Part D claims, 2024
- 127
- Publications
- 7
- Hospital affiliations
- 3
- Practice address
- 800 Riverside Drive, Waupaca, WI 54981
- Practice phone
- Call (715) 258-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Spencer Wolf Greaves is an emergency medicine physician in Waupaca, Wisconsin
Dr. Greaves practices at ThedaCare Medical Center-Waupaca in Waupaca, Wisconsin, part of Froedtert ThedaCare Health.
Dr. Greaves' NPI, 1457844102, was assigned on June 7, 2018. Dr. Greaves graduated from Medical College of Wisconsin in 2018. Dr. Greaves holds Wisconsin license 76902-20.
- NPI
- 1457844102NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6901284074
- NPI enumeration date
- June 7, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (715) 258-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Spencer Wolf Greaves practices at ThedaCare Medical Center-Waupaca in Waupaca, Wisconsin
Dr. Greaves' primary practice is ThedaCare Medical Center-Waupaca, at 800 Riverside Drive, Waupaca, WI 54981 in Waupaca County. The practice phone is (715) 258-1000.
- ThedaCare Medical Center-Waupaca800 Riverside Drive, Waupaca, WI 54981 · Waupaca CountyPhone(715) 258-1000
Source: Dmand AI Affiliation Data
Dr. Spencer Wolf Greaves is affiliated with 3 sites of care and 7 medical groups
Dr. Greaves' primary practice is ThedaCare Medical Center-Waupaca in Waupaca, Wisconsin, part of Froedtert ThedaCare Health. Dr. Greaves is also affiliated with ThedaCare Medical Center-Shawano. The medical group on file is ThedaCare Medical Center-Waupaca. Dmand AI also links Dr. Greaves to 1 more hospital and 6 medical groups, each named with a free account. Dr. Greaves' employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Spencer Wolf Greaves' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Greaves practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| ThedaCare Medical Center-Waupaca | Available with a free account |
| +2 more sites and 6 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Spencer Wolf Greaves is one of 1,211 emergency medicine physicians in Wisconsin
Emergency medicine is Dr. Greaves' primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Greaves is licensed in Wisconsin.
Specialties and state licenses
- Emergency medicine, WisconsinPrimary
Emergency medicine physicians near Dr. Greaves
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. Spencer Wolf Greaves billed Medicare for 31 services in 2024
CMS data shows 31 Medicare services from Dr. Greaves across 2 procedure codes in 2024, for 38 Medicare patients. Medicare paid $1,927 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Greaves' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3252024: 1894%
- Tests and treatments
- 2023: 1842024: 1393%
Dr. Greaves compared with the Wisconsin median for emergency medicine physicians, 2024
- Dr. Greaves
- Wisconsin median
- Medicare services
- 31vs 24687% below
- Medicare patients
- 38vs 22183% below
- Part D claims
- 27vs 5753% below
Medians across 1,249 emergency medicine physicians in Wisconsin with Dmand AI profiles that report each measure.
Dr. Greaves' 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. Greaves and other emergency medicine physicians in Wisconsin.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Spencer Wolf Greaves treated 38 Medicare patients in 2024, average age 72
CMS counts 38 Medicare patients who saw Dr. Greaves in 2024. The largest group is 75 to 84, with 14 patients. 75% of them have high blood pressure, and 61% have high cholesterol. 39% are also on Medicaid. Their average risk score is 1.89, 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. Greaves' median patient age at 53, with 52% women.
Dr. Greaves' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Greaves' Medicare patients by sex, 2024
- Women2361%
- Men1539%
Chronic conditions among Dr. Greaves' Medicare patients, 2024
- High blood pressure75%
- High cholesterol61%
- Arthritis50%
- Anxiety42%
- Mood disorders39%
- Depression37%
- Diabetes34%
- Heart failure32%
Share of Medicare patients with each condition. A patient can have several.
Dr. Greaves' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 53
Patient panel by sex, all payers
- Women52%
- Men48%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Spencer Wolf Greaves wrote 127 Medicare Part D claims in 2024
In 2024, Dr. Greaves wrote 127 Medicare Part D claims for 94 patients. 93% of them were for generic drugs. CMS names the drug for 27 of them, across 2 drugs with 11 or more claims each, at $197 in total drug cost. In 2023, CMS named 59 claims across 4 drugs.
Dr. Greaves' Part D claims by kind of drug, 2024
- Generic118 claims93%
- Brand-name and other9 claims7%
Dr. Greaves' 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. Greaves' Part D claims, 2024
- Opioids10%13 of 127 claims
- Antibiotics47%60 of 127 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 592024: 2754%
Drugs named by CMS: 2 in 2024, 4 in 2023.
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. Spencer Wolf Greaves takes part in Medicare
Dr. Greaves 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. Spencer Wolf Greaves has 7 publications on record
Dmand AI links 7 papers to Dr. Greaves, published from 2013 to 2022. The most frequent topics are Propensity Score and Rectum. Dr. Greaves' most frequent co-authors are Scott M. Alter, MD, Lisa Marie Clayton, DO and Joshua Jacob Solano.
Dr. Greaves' papers by year, 2013 to 2022
Topics Dr. Greaves writes about most
- Propensity Score
- Rectum
Dr. Greaves' most frequent co-authors
- Scott M. Alter, MD3 shared papers
- Lisa Marie Clayton, DO3 shared papers
- Joshua Jacob Solano3 shared papers
Recent publications by Dr. Greaves
See who Dr. Greaves researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Greaves works with, so you can find a warm path to the right emergency medicine physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Spencer Wolf Greaves received $137 in industry payments in 2022
CMS Open Payments shows 2 general payments to Dr. Greaves from 2 drug and device companies in 2022. Food and beverage make up the largest share, 100% of the total. AstraZeneca Pharmaceuticals LP paid the most, $123.
Companies that paid Dr. Greaves the most, 2022 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Spencer Wolf Greaves graduated from Medical College of Wisconsin
Dr. Greaves graduated from Medical College of Wisconsin in 2018.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Spencer Wolf Greaves'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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Spencer Wolf Greaves
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. Spencer Wolf Greaves' NPI number?
Dr. Spencer Wolf Greaves' NPI number is 1457844102. It was assigned on June 7, 2018, and it is active in the NPI Registry.
What kind of doctor is Dr. Spencer Wolf Greaves?
Dr. Spencer Wolf Greaves is an emergency medicine physician in Waupaca, Wisconsin. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Spencer Wolf Greaves practice?
Dr. Greaves practices at 800 Riverside Drive, Waupaca, WI 54981. Dr. Greaves' primary practice is ThedaCare Medical Center-Waupaca in Waupaca, Wisconsin, part of Froedtert ThedaCare Health. Dmand AI also links Dr. Greaves to 1 hospital and 6 medical groups.
What is Dr. Spencer Wolf Greaves' office phone number?
The practice phone on file for Dr. Greaves is (715) 258-1000.
What is Dr. Spencer Wolf Greaves' medical license number?
Dr. Greaves holds Wisconsin license 76902-20.
Which hospitals is Dr. Spencer Wolf Greaves affiliated with?
Dr. Greaves practices at ThedaCare Medical Center-Waupaca in Waupaca, Wisconsin. Dr. Greaves is also affiliated with ThedaCare Medical Center-Shawano. Dmand AI links Dr. Greaves to 1 more hospital.
What medical group is Dr. Spencer Wolf Greaves part of?
Dr. Greaves is linked to ThedaCare Medical Center-Waupaca. Dmand AI links Dr. Greaves to 6 more medical groups.
Does Dr. Spencer Wolf Greaves accept Medicare?
Yes. CMS data shows Dr. Greaves billed Medicare for 31 services in 2024, and Dr. Greaves accepts Medicare assignment.
How many Medicare patients does Dr. Spencer Wolf Greaves see?
CMS counts 38 Medicare patients who saw Dr. Greaves in 2024, with an average age of 72.
What services does Dr. Spencer Wolf Greaves bill to Medicare?
In 2024, Dr. Greaves' most billed Medicare services were emergency department visit (99285) and heart test or procedure (93010).
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Where did Dr. Spencer Wolf Greaves go to medical school?
Dr. Greaves graduated from Medical College of Wisconsin in 2018.
What drugs does Dr. Spencer Wolf Greaves prescribe most?
In 2024 Medicare Part D data, Dr. Greaves' most prescribed drugs by claims were Cephalexin and Amoxicillin-Clavulanate Potass.
Has Dr. Spencer Wolf Greaves received payments from drug or device companies?
CMS Open Payments shows $137 in general payments to Dr. Greaves from 2 companies from 2022 to 2022. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Spencer Wolf Greaves been practicing?
Dr. Greaves graduated from medical school in 2018, 8 years ago.
Does Dr. Spencer Wolf Greaves do research?
Dmand AI links 7 publications to Dr. Greaves, published from 2013 to 2022.
Who does Dr. Spencer Wolf Greaves publish with?
Dr. Greaves' most frequent co-authors are Scott M. Alter, MD (3 shared papers), Lisa Marie Clayton, DO (3 shared papers) and Joshua Jacob Solano (3 shared papers).
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