What is Eugene Chien's NPI number?

Eugene Chien's National Provider Identifier (NPI) is 1821414590, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Eugene Chien's specialty?

Eugene Chien is listed in the NPPES registry with a primary specialty of Professional Counselor (Behavioral Health & Social Service Providers).

Where is Eugene Chien located?

Eugene Chien's practice location on file with NPPES is 9390 Base Line Rd, Rancho Cucamonga, CA 91701-5839.

What is Eugene Chien's phone number?

The practice phone number listed in the NPPES registry for Eugene Chien is (909) 484-5151.

Is Eugene Chien's NPI active?

Yes — Eugene Chien's NPI (1821414590) is active in the NPPES registry as of the last update on 2026-01-29.

IndividualActive

Eugene Chien

NPI 1821414590 · Professional Counselor · Rancho Cucamonga, CA

Eugene Chien is a Professional Counselor provider in Rancho Cucamonga, CA (NPI 1821414590).

Provider details

NPI number: 1821414590
Entity type: Individual
Primary specialty: Professional CounselorBehavioral Health & Social Service Providers
Sex: Male
Sole proprietor: No
License: 7991 (CA)

Specialties & taxonomies

Professional CounselorPrimary101YP2500XLicense 7991 (CA)
Behavioral Health & Social Service Providers

Profile Score

Detailed profile(76/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
12 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

9390 Base Line Rd

Rancho Cucamonga, CA 91701-5839

Phone: (909) 484-5151

Street-level locationGet directions

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Mailing address