Quick answers
- Which hospitals does John Addison work at?
- Medicare's official clinician data lists John Addison at 1 hospital: Boulder Community Health. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John Addison see patients?
- Medicare's clinician data lists 3 practice locations, including Longmont, CO, Boulder, CO and Mercer Island, WA. Call before your visit to confirm the address.
- What is John Addison's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does John Addison accept Medicare assignment?
- Yes. Medicare's clinician data says John Addison accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does John Addison offer telehealth?
- Medicare's clinician data says John Addison offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for John Addison?
- (303) 415-4246, as listed in official Medicare / NPI Registry data.
- What is John Addison's NPI number?
- 1659323087. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John Addison works
Medicare's Facility Affiliation Data lists John Addison at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Boulder Community HealthBoulder, CO · Acute Care Hospital · CCN 060027
Practice locations
Addresses where John Addison is enrolled with Medicare (CMS data updated 2026-10-02).
- 2101 Ken Pratt Blvd, Suite 104gLongmont, CO 80501 (303) 415‑4246
- 5495 Arapahoe Ave, Suite 100gBoulder, CO 80303 (303) 415‑4246
- 9725 SE 36th St, 214 Northwest GeriatricsMercer Island, WA 98040 (206) 275‑3588
Group practices
Medicare enrollment lists John Addison as a member of these groups (CMS data updated 2026-10-02).
- Boulder Community Health264 clinicians in the group
- John H Addison MD PS6 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Longmont
Clinicians with the same Medicare primary specialty in Longmont, CO — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Washington School Of Medicine |
| Graduation year | 1979 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1659323087 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians