John Watt Cornelius, M.S.W.
Clinical Social Worker · Germantown, MD
John Watt Cornelius, M.S.W. is a clinical social worker with a practice address in Germantown, Maryland, and NPI 1982740601, issued on Jan 29, 2007. Check the license (Maryland G11954, as entered in NPPES) with the Maryland board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John Watt Cornelius
- Credential
- M.S.W.
- Primary taxonomy
- Clinical Social Worker 1041C0700X
- License numbers
- G11954 MD
LG50028254 DC
Self-reported in NPPES; status is on the state search - Practice location
- 12900 Middlebrook Road, Germantown, MD 20874
- Phone
- (301) 588-8881
- Enumerated
- Jan 29, 2007
- Record last updated
- Jul 9, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest clinical social worker records → All 9,007 in Maryland → Look up another NPI →
Verify John Watt Cornelius in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maryland board licenses this profession
Search for license G11954Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
John Watt Cornelius among 9,007 clinical social worker records in Maryland
John Watt Cornelius, M.S.W. is one of 9,007 clinical social worker records with a practice address in Maryland. 11% 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 2007, is newer than 12% of them.
- NPI issued2007 · 12% of these records are older, 77% newer
- In a Medicare fileNo · 11% of these records are
- In the CMS Doctors and Clinicians fileNo · 19% of these records are
- Record last updated2007 · 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 1041C0700X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
75 clinical social worker records list a practice address in Germantown
They are 75 of the 1,327 NPPES records with a practice address in Germantown, and 9,007 clinical social worker records in Maryland. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 9,007 in Maryland → Every provider in Germantown → Clinical Social Worker nationwide →
The 8 clinical social worker records with the nearest ZIP codes
- Michael Abrahams, M.S.S.W.Germantown, MD 208741679596183
- Robyn BergerGermantown, MD 208741336305895
- Elaine Blong, MSWGermantown, MD 208741972599629
- Mary Jane Booker, MSWGermantown, MD 208741154530699
- Janet Hawkins-Pope, LCSWGermantown, MD 208741316941081
- Terese Hayes, LCSW-CGermantown, MD 208741538116603
- Claire Holcomb, LCSW-CGermantown, MD 208741033321484
- Christopher Jones, LCSW-CGermantown, MD 208741013266899
Common questions
What is John Watt Cornelius, M.S.W.'s NPI number?
John Watt Cornelius, M.S.W.'s National Provider Identifier (NPI) is 1982740601, issued on Jan 29, 2007. An NPI identifies a provider in billing; it is not a license.
Where is John Watt Cornelius, M.S.W. located?
The NPPES record lists a practice address at 12900 Middlebrook Road, Germantown, MD, 20874. Phone: (301) 588-8881. Providers update this record themselves, so call before visiting.
How can I verify John Watt Cornelius, M.S.W.'s license?
NPPES lists Maryland license number G11954, as entered by the provider. Search the Maryland board that licenses this profession; the NPPES record confirms identity 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. 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.