John Callon, ADT
NPI 1528639598 · Addiction (Substance Use Disorder) Counselor · Frederick, MD
John Callon, ADT is a Addiction (Substance Use Disorder) Counselor provider in Frederick, MD (NPI 1528639598).
Provider details
- NPI number
- 1528639598
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
- Credential
- ADT
- Sex
- Male
- Sole proprietor
- Yes
- License
- ADT2211 (MD)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
4 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
- 2021-07-09
- Last updated
- 2021-07-09
- Certified
- 2021-07-09
Frequently asked questions
- What is John Callon's NPI number?
- John Callon's National Provider Identifier (NPI) is 1528639598, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Callon's specialty?
- John Callon is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is John Callon located?
- John Callon's practice location on file with NPPES is 201 Broadway St Ste 110, Frederick, MD 21701-6696.
- What is John Callon's phone number?
- The practice phone number listed in the NPPES registry for John Callon is (240) 801-7799.
- Is John Callon's NPI active?
- Yes — John Callon's NPI (1528639598) is active in the NPPES registry as of the last update on 2021-07-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.