Joan Okkyung Cho, MD
Endocrinology, Diabetes & Metabolism Physician · New Haven, CT
Joan Okkyung Cho, MD is an endocrinology, diabetes & metabolism physician with a practice address in New Haven, Connecticut, and NPI 1942242490, issued on Jun 11, 2006. Check the license (Connecticut 027052, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Joan Okkyung Cho
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- 027052 CT
Self-reported in NPPES; status is on the state search - Practice location
- 55 Lock Street, New Haven, CT 06520
- Phone
- (203) 432-0076
- Enumerated
- Jun 11, 2006
- Record last updated
- Feb 28, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (203) 432-0075
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 214 in Connecticut → Look up another NPI →
Also registered at 55 Lock Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- William Aquila, PAPhysician Assistant1164463469
- David Arendt, ODOptometrist1497788764
- Thomas Brady, PA-CPhysician Assistant1447287826
- Elizabeth Cole, CNM, RNAdvanced Practice Midwife1306873161
- Christine Colton, MDDiagnostic Radiology Physician1942287396
- John Dailinger, PAPhysician Assistant1346282639
Verify Joan Okkyung Cho in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 027052Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
17 Medicare Part D claims, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Joan Okkyung Cho among 214 endocrinology, diabetes & metabolism physician records in Connecticut
Joan Okkyung Cho, MD is one of 214 endocrinology, diabetes & metabolism physician records with a practice address in Connecticut. 83% 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 13% of them.
- NPI issued2006 · 13% of these records are older, 55% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 68% of these records are
- Record last updated2011 · 60% 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 Connecticut 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 Connecticut
There are 214 endocrinology, diabetes & metabolism physician records in Connecticut.
All 214 in Connecticut → Every provider in New Haven → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Clare Flannery, M.D.New Haven, CT 065201831360742
- Barbara Gulanski, MDNew Haven, CT 065201194707810
- Kevan Herold, MDNew Haven, CT 065201083709463
- John Wysolmerski, MDNew Haven, CT 065201114050663
- Anika Anam, M.D.New Haven, CT 065191376885905
- Clemens Bergwitz, MDNew Haven, CT 065191518957067
- Jonathan Bogan, MDNew Haven, CT 065191326021536
- Sonia Hegde, D.O.New Haven, CT 065191487870101
Common questions
What is Joan Okkyung Cho, MD's NPI number?
Joan Okkyung Cho, MD's National Provider Identifier (NPI) is 1942242490, issued on Jun 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joan Okkyung Cho, MD located?
The NPPES record lists a practice address at 55 Lock Street, New Haven, CT, 06520. Phone: (203) 432-0076. Providers update this record themselves, so call before visiting.
How can I verify Joan Okkyung Cho, MD's license?
NPPES lists Connecticut license number 027052, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Joan Okkyung Cho, MD prescribe under Medicare Part D?
In 2024, Joan Okkyung Cho, MD had 17 Medicare Part D claims; 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.