What is Maxwell Shack's NPI number?

Maxwell Shack's National Provider Identifier (NPI) is 1619836020, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Maxwell Shack's specialty?

Maxwell Shack is listed in the NPPES registry with a primary specialty of Mental Health Counselor (Behavioral Health & Social Service Providers).

Where is Maxwell Shack located?

Maxwell Shack's practice location on file with NPPES is 505 N Tustin Ave Ste 265, Santa Ana, CA 92705-3775.

What is Maxwell Shack's phone number?

The practice phone number listed in the NPPES registry for Maxwell Shack is (866) 766-4935.

Is Maxwell Shack's NPI active?

Yes — Maxwell Shack's NPI (1619836020) is active in the NPPES registry as of the last update on 2026-01-20.

IndividualActive

Maxwell Shack

NPI 1619836020 · Mental Health Counselor · Santa Ana, CA

Maxwell Shack is a Mental Health Counselor provider in Santa Ana, CA (NPI 1619836020).

Provider details

NPI number: 1619836020
Entity type: Individual
Primary specialty: Mental Health CounselorBehavioral Health & Social Service Providers
Sex: Male
Sole proprietor: Yes
License: 21497 (CA)

Specialties & taxonomies

Mental Health CounselorPrimary101YM0800XLicense 21497 (CA)
Behavioral Health & Social Service Providers

Profile Score

Established profile(53/100 index)

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

Registry tenure38% of score
Under 1 yr in 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

505 N Tustin Ave Ste 265

Santa Ana, CA 92705-3775

Phone: (866) 766-4935

Street-level locationGet directions

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Mailing address