Dr. John Castronovo, MD
Allergy & Immunology · Brooklyn, NY
Independent provider — not employed by, affiliated with, or endorsed by Ondoc. Listed only so patients can identify the clinician who previously treated or prescribed for them.
- NPI
- 1255463600
- Primary specialty
- Allergy & Immunology
- Registered location
- 2527 Cropsey Ave, Brooklyn, NY, 11214
Why this page exists
Ondoc mirrors the public CMS NPPES registry so you can tell us exactly who last saw you or who prescribed your medicine. Selecting Dr. John Castronovo, MD attaches that identity to your request for continuity of care. Any refill you request is reviewed and issued by an Ondoc-licensed provider — not by Dr. John Castronovo, MD.
Nearby on Ondoc
Source: Public NPPES NPI Registry, maintained by the Centers for Medicare & Medicaid Services (CMS). Independent providers are listed for patient reference so Ondoc users can identify a previous prescriber or send a referral. Listing does not imply employment, endorsement, or a contractual relationship with Ondoc.