John F. O'Brien, A.P.R.N.
Certified Registered Nurse Anesthetist · Danbury, CT
John F. O'Brien, A.P.R.N. is a certified registered nurse anesthetist with a practice address in Danbury, Connecticut, and NPI 1043336258, issued on Mar 21, 2007. Check the license (Connecticut 003588, as entered in NPPES) with the Connecticut board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- John F. O'Brien
- Credential
- A.P.R.N.
- Primary taxonomy
- Certified Registered Nurse Anesthetist 367500000X
- License number
- 003588 CT
Self-reported in NPPES; status is on the state search - Practice location
- 24 Hospital Ave, Danbury, CT 06810
- Phone
- (203) 797-7118
- Enumerated
- Mar 21, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20070620000561); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest certified registered nurse anesthetist records → All 880 in Connecticut → Look up another NPI →
Also registered at 24 Hospital Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jacqueline AddonaStudent in an Organized Health Care Education/Training Program1669232443
- Fernando Afonso, M.D.Internal Medicine Physician1992980536
- Alka Aggarwal, MDInternal Medicine Physician1427041987
- Mohamed Ahmed, M.D.Internal Medicine Physician1235391756
- Syed Rakin Ahmed, MD, PHDStudent in an Organized Health Care Education/Training Program1518809870
- Gregory Albert, MDAnesthesiology Physician1588797930
Verify John F. O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Connecticut board licenses this profession
Search for license 003588Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Woodland Anesthesia Associates PCHartford, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John F. O'Brien among 880 certified registered nurse anesthetist records in Connecticut
John F. O'Brien, A.P.R.N. is one of 880 certified registered nurse anesthetist records with a practice address in Connecticut. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 34% of them.
- NPI issued2007 · 34% of these records are older, 63% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2006 · median 2014 among the 653 with a school on file
- Record last updated2007 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 367500000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
39 certified registered nurse anesthetist records list a practice address in Danbury
They are 39 of the 2,412 NPPES records with a practice address in Danbury, and 880 certified registered nurse anesthetist records in Connecticut.
All 880 in Connecticut → Every provider in Danbury → Certified Registered Nurse Anesthetist nationwide →
The 8 certified registered nurse anesthetist records with the nearest ZIP codes
- Robert Banas, CRNADanbury, CT 068101992733489
- Donna Collins, C.R.N.A.Danbury, CT 068101669556015
- Maureen Devlin, CRNA, ACNP-BCDanbury, CT 068101417199209
- Catherine Dunne, CRNADanbury, CT 068101417936816
- Isabel Fappiano, C.R.N.A.Danbury, CT 068101720031313
- Jessica Hamlin, RN, MS, CRNADanbury, CT 068101023341369
- Timothy Hendrie, CRNADanbury, CT 068101174526933
- Cristina Imperio, C.R.N.A.Danbury, CT 068101538258892
Common questions
What is John F. O'Brien, A.P.R.N.'s NPI number?
John F. O'Brien, A.P.R.N.'s National Provider Identifier (NPI) is 1043336258, issued on Mar 21, 2007. An NPI identifies a provider in billing; it is not a license.
Where is John F. O'Brien, A.P.R.N. located?
The NPPES record lists a practice address at 24 Hospital Ave, Danbury, CT, 06810. Phone: (203) 797-7118. Providers update this record themselves, so call before visiting.
How can I verify John F. O'Brien, A.P.R.N.'s license?
NPPES lists Connecticut license number 003588, as entered by the provider. Search the Connecticut 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. 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.