Clare Elizabeth O'Connor, MD
Endocrinology, Diabetes & Metabolism Physician · Madison, WI
Clare Elizabeth O'Connor, MD is an endocrinology, diabetes & metabolism physician with a practice address in Madison, Wisconsin, and NPI 1992123178, issued on Apr 3, 2014. Check the license (Wisconsin 65508-20, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Clare Elizabeth O'Connor
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License numbers
- 65508-20 WI
036143104 IL
Self-reported in NPPES; status is on the state search - Practice location
- 5249 E Terrace Dr, Madison, WI 53718
- Phone
- (608) 265-7406
- Enumerated
- Apr 3, 2014
- Record last updated
- Jan 22, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (608) 265-7519
- Medicare enrollment
- Enrolled (PECOS I20191011002623); accepts Medicare assignment
- Medical or professional school
- University Of Wisconsin School Of Medicine, 2014
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 187 in Wisconsin → Look up another NPI →
Also registered at 5249 E Terrace Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Candye Andrus, MDPediatrics Physician1942247226
- Molly Barrie, APNPNurse Practitioner1972977395
- Kyla Bertschinger, PT, DPTPhysical Therapist1164316543
- Renee Bobb, NPNurse Practitioner1962894121
- Jillian Bodden Hoenisch, DNP, AGPCNP-BC, APNPPrimary Care Nurse Practitioner1871145367
- Marcia Bolles, PA-CPhysician Assistant1003198029
Verify Clare Elizabeth O'Connor in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 65508-20Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
42% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
1,519 Medicare Part D claims for 222 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 53% of claims.
Most prescribed
- Levothyroxine Sodium172 claims
- Alendronate Sodium129 claims
- Mounjaro109 claims
- Lantus Solostar77 claims
- Metformin Hcl67 claims
- Hydrocortisone56 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through 2 group practices
- Southwest Health Center IncPlatteville, WI
- University OF Wisconsin Medical Foundation IncMadison, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Clare Elizabeth O'Connor among 187 endocrinology, diabetes & metabolism physician records in Wisconsin
Clare Elizabeth O'Connor, MD is one of 187 endocrinology, diabetes & metabolism physician records with a practice address in Wisconsin. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 72% of them.
- NPI issued2014 · 72% of these records are older, 24% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2014 · median 2003 among the 134 with a school on file
- Record last updated2021 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in Wisconsin
There are 187 endocrinology, diabetes & metabolism physician records in Wisconsin.
All 187 in Wisconsin → Every provider in Madison → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Maria Bernal Riera, MDMadison, WI 537181144872425
- Ty Carroll, MDMadison, WI 537181558312942
- Bjoern Buehring, M.D.Madison, WI 537171083779045
- Pennapa Chan, MDMadison, WI 537171457405128
- Vincent Cryns, M.D.Madison, WI 537171639235039
- Gihan Dawood, DOMadison, WI 537171255489746
- Subarna Dhital, MDMadison, WI 537171356518047
- Maxfield Flynn, M.D.Madison, WI 537171770716185
Common questions
What is Clare Elizabeth O'Connor, MD's NPI number?
Clare Elizabeth O'Connor, MD's National Provider Identifier (NPI) is 1992123178, issued on Apr 3, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Clare Elizabeth O'Connor, MD located?
The NPPES record lists a practice address at 5249 E Terrace Dr, Madison, WI, 53718. Phone: (608) 265-7406. Providers update this record themselves, so call before visiting.
How can I verify Clare Elizabeth O'Connor, MD's license?
NPPES lists Wisconsin license number 65508-20, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Clare Elizabeth O'Connor, MD prescribe under Medicare Part D?
In 2024, Clare Elizabeth O'Connor, MD had 1,519 Medicare Part D claims for 222 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.