MR. MICHAEL CHARLES CHRISTIAN KESSLER
NPI 1790985042
Social Worker - Clinical in Santa Rosa, CA

Q: What is Michael Kessler's NPI number?

The NPI number for Michael Kessler is 1790985042. It was assigned to this individual provider in the NPPES registry on July 24, 2007. The provider is also known as Mr. Micki Ann Williams.

Q: What is Michael Kessler's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

Q: When was this NPI record last updated?

The NPPES record for Michael Kessler was last updated on May 11, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since July 24, 2007PECOS Enrolled

490 MENDOCINO AVE, SUITE 202, SANTA ROSA, CA 95401(707) 494-2974(415) 565-4881 Get Directions Write a Review

NPPES record last updated: May 11, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: May 11, 2021, Sep 26, 2016 (2 updates tracked since 2016).

On this page

About Mr. Michael Charles Christian Kessler NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MR. MICHAEL CHARLES CHRISTIAN KESSLER (NPI 1790985042) is an individual clinical provider in Santa Rosa, California, licensed in California (LCSW73368) and active in the NPI registry since July 2007. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1790985042

Entity TypeIndividualMale

Primary Taxonomy1041C0700X

Provider Legal NameMR. MICHAEL CHARLES CHRISTIAN KESSLER

Location Address490 MENDOCINO AVE, SUITE 202Santa Rosa, CA 95401-8530

Mailing Address2227 Capricorn Way Ste 207Santa Rosa, CA 95407-5486 · (707) 565-5006 · Fax (707) 565-4907

Phone(707) 494-2974

Fax(415) 565-4881

Sole ProprietorNo

Enumeration DateJuly 24, 2007

Last NPPES UpdateMay 11, 20212 updates tracked since enumeration

NPPES CertifiedMay 11, 2021

✔ NPI 1790985042 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 4

★ Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers

Taxonomy Code1041C0700X

License✔ Licensed in CA · LCSW73368

Definition

A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.

Also ListedCounselorTaxonomy 101Y00000X · License ASW24005 (CA)

Also ListedCounselor · Mental HealthTaxonomy 101YM0800X · License ASW 62549 (CA)

Also ListedSocial WorkerTaxonomy 104100000X · License ASW 62549 (CA)

490 MENDOCINO AVE, Santa Rosa, CA 95401

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Other Names 1

Former Name (1)Mr. Micki Ann Williams

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mr. Michael Charles Christian Kessler is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Michael Kessler reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Permanente Medical Group Inc

33 mi

Internal Medicine

975 SERENO DRIVE
Vallejo, CA 94589

Reassigned Medicare billing, California enrollment
20,078 clinicians in this Medicare group

NPI 1336222397 (707) 651-1000

Grow Healthcare Group PC

89 mi

Mental Health

99 S ALMADEN BLVD STE 600
San Jose, CA 95113

Reassigned Medicare billing, California enrollment
3,139 clinicians in this Medicare group

NPI 1154994846 (408) 402-4385

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 95401 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$0.00 typical visit price

range $63.04 – $187.01

Typical copayment $0.00 (range $15.76 – $46.75)

Most-billed visit code NA

Established Patient

$77.94 typical visit price

range $21.02 – $153.40

Typical copayment $19.48 (range $5.25 – $38.35)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

CRUZ LOPEZ

Marriage & Family Therapist

490 MENDOCINO AVE, SUITE 202
SANTA ROSA, CA 95401

Sonoma County (707) 565-4812

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Michael Kessler's NPI number?

The NPI number for Michael Kessler is 1790985042. It was assigned to this individual provider in the NPPES registry on July 24, 2007. The provider is also known as Mr. Micki Ann Williams.

Where is Michael Kessler located?

Michael Kessler practices at 490 Mendocino Ave Suite 202, Santa Rosa, CA 95401. The listed phone number is (707) 494-2974.

What is Michael Kessler's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

Is Michael Kessler enrolled in Medicare?

Yes. Michael Kessler is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Michael Kessler's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Michael Kessler reassigns Medicare benefits to 2 organizations: Permanente Medical Group Inc (Vallejo, CA) and Grow Healthcare Group PC (San Jose, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Michael Kessler's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Michael Kessler was last updated on May 11, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.