Charles Johnston, MD
NPI 1659408466 · Emergency Medicine Physician · Hillsdale, MI
Charles Johnston, MD is a Emergency Medicine Physician provider in Hillsdale, MI (NPI 1659408466).
Provider details
- NPI number
- 1659408466
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 038008 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-02-28
- Last updated
- 2007-07-08
Frequently asked questions
- What is Charles Johnston's NPI number?
- Charles Johnston's National Provider Identifier (NPI) is 1659408466, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charles Johnston's specialty?
- Charles Johnston is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Charles Johnston located?
- Charles Johnston's practice location on file with NPPES is 168 S Howell St, Hillsdale, MI 49242-2040.
- What is Charles Johnston's phone number?
- The practice phone number listed in the NPPES registry for Charles Johnston is (517) 437-4451.
- Is Charles Johnston's NPI active?
- Yes — Charles Johnston's NPI (1659408466) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.