Gregory Wong Demeo, D.O.
Obstetrics & Gynecology Physician · Newark, DE
Gregory Wong Demeo, D.O. is an obstetrics & gynecology physician with a practice address in Newark, Delaware, and NPI 1497712657, issued on Apr 28, 2006. Check the license (Delaware C20003423, as entered in NPPES) on the Delaware Board of Medical Licensure and Discipline; the Medicare figures below come from public CMS files.
- Name
- Gregory Wong Demeo
- Credential
- D.O.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- C20003423 DE
Self-reported in NPPES; status is on the state search - Practice location
- 4745 Ogletown Stanton RD, Newark, DE 19713
- Phone
- (302) 454-9800
- Enumerated
- Apr 28, 2006
- Record last updated
- Apr 2, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (302) 454-6446
- Medicare enrollment
- Enrolled (PECOS I20051216000347); accepts Medicare assignment
- Medical or professional school
- Rowan University School Of Osteopathic Medicine, 1987
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 152 in Delaware → Look up another NPI →
Also registered at 4745 Ogletown Stanton RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Michael Axe, MDSports Medicine (Orthopaedic Surgery) Physician1578534558
- Mehdi Balakhani, M.D., D.D.S., PASpecialist1831194224
- Stefanie Barnes, CNMMidwife1184064537
- Julia Bergeman, PA-CPhysician Assistant1194329854
Verify Gregory Wong Demeo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersDelaware Board of Medical Licensure and Discipline
Search for license C20003423Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
67% more Medicare Part D claims than the average obstetrics & gynecology physician in 2024
276 Medicare Part D claims for 93 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims.
Most prescribed
- Estradiol59 claims
- Raloxifene Hcl35 claims
- Alendronate Sodium24 claims
- Premarin23 claims
- Progesterone18 claims
- Risedronate Sodium18 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.
Industry payments in 2024: $295.48
16 payments; by number, the most common kind was food and beverage; the largest payer was Millicent US Inc. The 21,429 providers of this specialty with any payment received $1,030.61 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Lifeline Medical Associates LLCNewark, DE
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Wong Demeo among 152 obstetrics & gynecology physician records in Delaware
Gregory Wong Demeo, D.O. is one of 152 obstetrics & gynecology physician records with a practice address in Delaware. 76% 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 15% of them.
- NPI issued2006 · 15% of these records are older, 50% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated1987 · median 2003 among the 98 with a school on file
- Record last updated2021 · 65% 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 Delaware practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
73 obstetrics & gynecology physician records list a practice address in Newark
They are 73 of the 4,662 NPPES records with a practice address in Newark, and 152 obstetrics & gynecology physician records in Delaware.
All 152 in Delaware → Every provider in Newark → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Faith Brosch, M.D,Newark, DE 197131053343863
- Karen Earl, M.D.Newark, DE 197131467487827
- Joanne Goshow-Harris, D.O.Newark, DE 197131033140116
- Moses Hochman, MDNewark, DE 197131528045093
- William Hohman, MDNewark, DE 197131487631941
- Molly Larkin, M.D.Newark, DE 197131063443133
- Stefanie Marshall, DONewark, DE 197131184691156
- Helen McCullough, D.O.Newark, DE 197131811928989
Common questions
What is Gregory Wong Demeo, D.O.'s NPI number?
Gregory Wong Demeo, D.O.'s National Provider Identifier (NPI) is 1497712657, issued on Apr 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Wong Demeo, D.O. located?
The NPPES record lists a practice address at 4745 Ogletown Stanton RD, Newark, DE, 19713. Phone: (302) 454-9800. Providers update this record themselves, so call before visiting.
How can I verify Gregory Wong Demeo, D.O.'s license?
NPPES lists Delaware license number C20003423, as entered by the provider. Search the Delaware Board of Medical Licensure and Discipline at https://delpros.delaware.gov/OH_VerifyLicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gregory Wong Demeo, D.O. prescribe under Medicare Part D?
In 2024, Gregory Wong Demeo, D.O. had 276 Medicare Part D claims for 93 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.