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    Dr. Tim W. Grennan, MD


    Dr. Grennan's Overview

    Dr. Grennan graduated from the University of Nebraska College of Medicine in 1976. He works in Sacramento, CA and specializes in Hematology/Oncology. Dr. Grennan is affiliated with Kaiser Permanente Sacramento Medical Center.

    Dr. Grennan's Experience

    Years in Practice: 40

    Procedures Performed by Dr. Grennan

    Dr. Grennan's Specialties


    Dr. Grennan's Education & Training

    Medical School: University of Nebraska College of Medicine; Graduated 1976

    Dr. Grennan's Rating

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    Overall Rating


    • Explains conditions & treatments
    • Takes time to answer my questions
    • Provides follow-up as needed
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    Dr. Grennan's Accepted Insurance

    Please verify insurance information directly with your doctor's office as it may change frequently.

    • Kaiser Permanente

    Dr. Grennan's Office Information & Appointments

    Office Locations

    Kaiser Permanente Medical Group
    Kaiser Permanente Sacramento Medical Center

    2025 Morse Ave
    Sacramento, CA 95825
    (916) 973-5000


    Office Hours and Information

    Fax: (916) 746-3640

    Practice Website:

    Accepting New Patients: Yes

    Medicare Accepted: Yes

    Medicaid Accepted: Yes

    Not Available

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