Randall Ahn, PHD, MLIS
NPI 1093939399 · Clinical Child & Adolescent Psychologist · Fontana, CA
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Randall Ahn, PHD, MLIS is a Clinical Child & Adolescent Psychologist provider in Fontana, CA (NPI 1093939399).
Provider details
- NPI number
- 1093939399
- Entity type
- Individual
- Primary specialty
- Clinical Child & Adolescent PsychologistBehavioral Health & Social Service Providers
- Credential
- PHD, MLIS
- Sex
- Male
- Sole proprietor
- Yes
- License
- PSY13956 (CA)
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
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
3 documented practice locations
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
Additional practice locations (2)
- 3137 Dwight Rd Ste 600Elk Grove, CA 95758-6472Phone: (909) 244-9593
- 5201 Great America Pkwy Ste 320Santa Clara, CA 95054-1140Phone: (323) 205-7088Fax: (833) 419-0181
Registry dates
- Enumerated
- 2007-04-11
- Last updated
- 2024-05-07
- Certified
- 2024-05-07
Frequently asked questions
- What is Randall Ahn's NPI number?
- Randall Ahn's National Provider Identifier (NPI) is 1093939399, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Randall Ahn's specialty?
- Randall Ahn is listed in the NPPES registry with a primary specialty of Clinical Child & Adolescent Psychologist (Behavioral Health & Social Service Providers).
- Where is Randall Ahn located?
- Randall Ahn's practice location on file with NPPES is 16465 Sierra Lakes Pkwy Ste 140, Fontana, CA 92336-1242.
- What is Randall Ahn's phone number?
- The practice phone number listed in the NPPES registry for Randall Ahn is (909) 244-9593.
- Does Randall Ahn accept Medicare?
- Randall Ahn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Randall Ahn's NPI active?
- Yes — Randall Ahn's NPI (1093939399) is active in the NPPES registry as of the last update on 2024-05-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.