Darin Ray Gregory, MD
Obstetrics & Gynecology Physician · Waukesha, WI
Darin Ray Gregory, MD is an obstetrics & gynecology physician with a practice address in Waukesha, Wisconsin, and NPI 1023189198, issued on Nov 12, 2006. Check the license (Wisconsin 49075-020, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Darin Ray Gregory
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- 49075-020 WI
Self-reported in NPPES; status is on the state search - Practice location
- 1111 Delafield St Ste 120, Waukesha, WI 53188
- Phone
- (262) 544-4411
- Enumerated
- Nov 12, 2006
- Record last updated
- Mar 31, 2025
- Fax
- (262) 650-3856
- Medicaid ID
- 35214100 WI
- Medicare enrollment
- Enrolled (PECOS I20080919000179); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 796 in Wisconsin → Look up another NPI →
Also registered at 1111 Delafield St Ste 120
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jason Abels, LAT, CSCSAthletic Trainer1639213770
- Jason Anderson, LATAthletic Trainer1881729671
- Lorree Dyoco, MDObstetrics & Gynecology Physician1497728448
- Jami Graber, RNRegistered Nurse1053285064
- Jessica Herzberg, MDObstetrics & Gynecology Physician1750570180
- Sarah Janz, M.D.Obstetrics & Gynecology Physician1336367168
Verify Darin Ray Gregory in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 49075-020Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
10% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
148 Medicare Part D claims for 45 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.
Most prescribed
- Estradiol32 claims
- Norethindrone12 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 one group practice
- Moreland OB-Gyn Associates S CWaukesha, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Darin Ray Gregory among 796 obstetrics & gynecology physician records in Wisconsin
Darin Ray Gregory, MD is one of 796 obstetrics & gynecology physician records with a practice address in Wisconsin. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 47% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2008 · median 2007 among the 478 with a school on file
- Record last updated2025 · 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 207V00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
29 obstetrics & gynecology physician records list a practice address in Waukesha
They are 29 of the 2,814 NPPES records with a practice address in Waukesha, and 796 obstetrics & gynecology physician records in Wisconsin.
All 796 in Wisconsin → Every provider in Waukesha → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Dana Akiya, MDWaukesha, WI 531881407915796
- Beth Angsten, M.D.Waukesha, WI 531881174596217
- Joi Davis, DOWaukesha, WI 531881932172988
- Lorree Dyoco, MDWaukesha, WI 531881497728448
- Laura Epperson, MDWaukesha, WI 531881225028715
- Jessica Herzberg, MDWaukesha, WI 531881750570180
- Sarah Janz, M.D.Waukesha, WI 531881336367168
- Roger Lalich, DOWaukesha, WI 531881326038811
Common questions
What is Darin Ray Gregory, MD's NPI number?
Darin Ray Gregory, MD's National Provider Identifier (NPI) is 1023189198, issued on Nov 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Darin Ray Gregory, MD located?
The NPPES record lists a practice address at 1111 Delafield St Ste 120, Waukesha, WI, 53188. Phone: (262) 544-4411. Providers update this record themselves, so call before visiting.
How can I verify Darin Ray Gregory, MD's license?
NPPES lists Wisconsin license number 49075-020, 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 Darin Ray Gregory, MD prescribe under Medicare Part D?
In 2024, Darin Ray Gregory, MD had 148 Medicare Part D claims for 45 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.