William Harrison Koch, MD
Child & Adolescent Psychiatry Physician · Greenwich, CT
William Harrison Koch, MD is a child & adolescent psychiatry physician with a practice address in Greenwich, Connecticut, and NPI 1083884753, issued on Mar 9, 2008. Check the license (Connecticut 025221, as entered in NPPES) on the Connecticut Medical Examining Board; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- William Harrison Koch
- Credential
- MD
- Primary taxonomy
- Child & Adolescent Psychiatry Physician 2084P0804X
- License number
- 025221 CT
Self-reported in NPPES; status is on the state search - Practice location
- 151 Milbank Ave, Greenwich, CT 06830
- Phone
- (203) 622-0337
- Enumerated
- Mar 9, 2008
- Record last updated
- Mar 9, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (203) 622-1726
- Entity
- Type 1 · individual
8 nearest child & adolescent psychiatry physician records → All 225 in Connecticut → Look up another NPI →
Verify William Harrison Koch in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 025221Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
William Harrison Koch among 225 child & adolescent psychiatry physician records in Connecticut
William Harrison Koch, MD is one of 225 child & adolescent psychiatry physician records with a practice address in Connecticut. 55% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2008, is newer than 54% of them.
- NPI issued2008 · 54% of these records are older, 36% newer
- In a Medicare fileNo · 55% of these records are
- In the CMS Doctors and Clinicians fileNo · 24% of these records are
- Record last updated2008 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0804X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Child & Adolescent Psychiatry Physician providers in Connecticut
There are 225 child & adolescent psychiatry physician records in Connecticut. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 225 in Connecticut → Every provider in Greenwich → Child & Adolescent Psychiatry Physician nationwide →
The 8 child & adolescent psychiatry physician records with the nearest ZIP codes
- M Bridget Downes, M.D.Greenwich, CT 068301326197286
- Alvin Rosenfeld, M.D.Greenwich, CT 068301467745752
- Daniella Stavreva-Zlatareva, M.D.Greenwich, CT 068301497892251
- Jean Marachi, MDFairfield, CT 068241851479844
- Ava Albrecht, M.D.New Canaan, CT 068401982766317
- Oscar Gerdner, MDDarien, CT 068201801209952
- Daniel Mason, MDNew Canaan, CT 068401760584429
- Aura Ardon, MDDanbury, CT 068101780839787
Common questions
What is William Harrison Koch, MD's NPI number?
William Harrison Koch, MD's National Provider Identifier (NPI) is 1083884753, issued on Mar 9, 2008. An NPI identifies a provider in billing; it is not a license.
Where is William Harrison Koch, MD located?
The NPPES record lists a practice address at 151 Milbank Ave, Greenwich, CT, 06830. Phone: (203) 622-0337. Providers update this record themselves, so call before visiting.
How can I verify William Harrison Koch, MD's license?
NPPES lists Connecticut license number 025221, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.