# John M. O'Day John M. O'Day is a sleep clinic with an address in Somersworth, NH, United States. ## Details - Address: 361 HIGH ST, Somersworth, NH, 03878, United States - Phone: [603-692-4500]() - National Provider Identifier (NPI): 1518051382 - Provider type: Sleep disorder diagnostic clinic - Sleep studies offered: In-lab polysomnography (CPT 95810), Home sleep apnea test (CPT 95806 / G0399) - Source of the listing data: CMS NPI Registry, retrieved 2026-10-28, public, free ## Questions ### Where is John M. O'Day? John M. O'Day is at 361 HIGH ST, Somersworth, NH, 03878, United States. ### How do I contact John M. O'Day? To contact John M. O'Day, call 603-692-4500. ### Is John M. O'Day accepting new patients? That is not in the registry data. Call the phone number on the listing and ask about availability, referral rules, wait times and insurance. ## Source From [CMS NPI Registry (National Plan and Provider Enumeration System)](https://npiregistry.cms.hhs.gov/api/?version=2.1&number=1518051382), license US government public data. CMS publishes NPPES provider data for open access under its data dissemination notice., checked 2026-10-29. Last updated October 29, 2026. ## Links - This sleep clinic on the [web page]() - [Sleep studies in Somersworth]() - [Home sleep apnea testing providers in Somersworth]() - [In-lab polysomnography centers in Somersworth]() - [Sleep disorder diagnostic clinics in Somersworth]() - [More sleep clinics in Somersworth]()