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TIMMEN CERMAK M.D.
NPI 1235341330
Psychiatry & Neurology - Addiction Psychiatry in Mill Valley, CA

Active since May 03, 2007Opted out of Medicare · through Jan 1, 2028
239 MILLER AVENUE, SUITE #1, MILL VALLEY, CA 94941(415) 381-4009 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Timmen Cermak M.d. NPPES

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

TIMMEN CERMAK M.D. (NPI 1235341330) is an individual addiction psychiatry provider in Mill Valley, California, licensed in California (G-31376) and active in the NPI registry since May 2007. He has opted out of Medicare through January 1, 2028 and remains eligible to order and refer.

NPPES Registry Identity

NPI1235341330
Entity TypeIndividualMale
Primary Taxonomy2084P0802X
Provider Legal NameTIMMEN CERMAKCredential: M.D.
Location Address239 MILLER AVENUE, SUITE #1Mill Valley, CA 94941
Mailing Address239 Miller Avenue, Suite #1Mill Valley, CA 94941
Phone(415) 381-4009
Sole ProprietorYes
Enumeration DateMay 3, 2007
Last NPPES UpdateJuly 8, 2007
✔ NPI 1235341330 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · Addiction PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0802X
License✔ Licensed in CA · G-31376
Definition
Addiction Psychiatry is a subspecialty of psychiatry that focuses on evaluation and treatment of individuals with alcohol, drug, or other substance-related disorders, and of individuals with dual diagnosis of substance-related and other psychiatric disorders.
239 MILLER AVENUE, Mill Valley, CA 94941
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

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Opted out of Medicare

Timmen Cermak M.d. has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from January 1, 2016 through January 1, 2028.

Opt-Out Effective DateJanuary 1, 2016
Opt-Out In Effect ThroughJanuary 1, 2028Opt-out affidavits renew automatically every two years unless cancelled
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

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 Timmen Cermak's NPI number?

The NPI number for Timmen Cermak is 1235341330. It was assigned to this individual provider in the NPPES registry on May 3, 2007.

Where is Timmen Cermak located?

Timmen Cermak practices at 239 Miller Avenue Suite #1, Mill Valley, CA 94941. The listed phone number is (415) 381-4009.

What is Timmen Cermak's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Addiction Psychiatry, with taxonomy code 2084P0802X.

Is Timmen Cermak enrolled in Medicare?

No. Timmen Cermak has opted out of Medicare through January 1, 2028. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for Timmen Cermak was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.