Dr. Mark Stilphen, MD

Dr. Mark Stilphen, MD

Endocrinology, Diabetes & Metabolism  |  
Male  |  
69 y/o

Accepting new patients

Dr. Stilphen has over 37 years of experience and specializes in endocrinology, diabetes & metabolism and internal medicine. Dr. Stilphen practices at the Pacific Coast Health Center.

Medical Clinic at Peach

1250 Peach St Ste B

San Luis Obispo, CA 93401
Get Directions

Accepted insurance

  • Aetna
  • Blue Cross Blue Shield
  • Blue Cross Blue Shield of California
  • Blue Shield of California
  • Cigna
  • First Health (Coventry Health Care)
  • Medi-Cal
  • Medicare
  • MultiPlan

Learn about Dr. Stilphen

Be confident in your decisions by checking out your provider's top areas of care, education, patient reviews and more. Learn about finding the right doctor for you

Top Care Areas


See how frequently Dr. Stilphen performs your care needs compared to other doctors.

more than 84% of peers
Bone Disorders
more than 75% of peers
Thyroid Disease
more than 73% of peers

Dr. Stilphen's percentages are based on the rate of treatment compared to peers nationwide from insurance data. Learn more info about our data and this Top Care Areas component.

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Care Philosophy

This content was provided by Dr. Stilphen "To actively listen and to give as good medical care as I can. "


  • Endocrinology, Diabetes & Metabolism
  • Endocrinology & Metabolism
  • Internal Medicine

Board Certifications

  • Diabetes, Metabolism & Endocrinology
    Accredited by: American Board of Internal Medicine*
  • Internal Medicine
    Accredited by: American Board of Internal Medicine*

Conditions Treated

  • Adrenal Gland Diseases
  • Adrenal Incidentaloma
  • Autoimmune Diseases
  • Autoimmune Thyroid Diseases
  • Benign Tumor
  • Bone Disorders
  • Breast Diseases
  • Calcium Metabolism Disorders
  • Cancer
  • Diabetes
  • Diabetes Type 1
  • Diabetes Type 2
  • Diabetes With Renal Manifestations
  • Diabetic Ketoacidosis
  • Female Infertility
  • Goiter
  • Graves' Disease
  • Growth Hormone Deficiency
  • Gynecomastia
  • Hypercalcemia
  • Hyperkalemia
  • Hyperlipidemia
  • Hyperparathyroidism
  • Hyperthyroidism
  • Hypokalemia
  • Hypopituitarism
  • Hyposmolality and Hyponatremia
  • Hypothyroidism
  • Kidney Disease
  • Lipid Disorders
  • Malaise and Fatigue
  • Obesity
  • Osteopenia
  • Osteoporosis
  • Proteinuria
  • Symptomatic Menopause
  • Testicular Dysfunction
  • Thyroid Cancer
  • Thyroid Cyst
  • Thyroid Disease
  • Vitamin D Deficiency


Read More


  • Chronic Diabetes Management
  • Diabetes Counseling

Background Check

0 Malpractice Claims

No malpractice history found for California.

0 Sanctions

No sanctions history found for the years that Healthgrades collects data.

0 Board Actions

No board actions found for the years that Healthgrades collects data.


  • Williams College
    Undergraduate School | Graduated 1969
  • Northwestern University Medical School
    Medical School | Graduated 1973
  • New England Deaconess Hospital and Medical Center
    Internship Hospital | Completed 1974
  • UCLA San Fernando Valley Medical Program
    Residency Hospital | Completed 1977
  • UCLA San Fernando Valley Medical Program - Chief Medical Residency and Endocrine
    Fellowship Hospital | Completed 1979

Awards & Recognition

Awards & Honors
  • Healthgrades Honor Roll
Media & Publications

Dr. Stilphen has no media or publications listed.

Languages Spoken

  • English

Memberships & Professional Affiliations

  • UCLA Medical School, Associate Professor

Dr. Stilphen's Reviews

Likelihood of recommending Dr. Stilphen to family and friends
based on 21 total reviews (2 with comments)
Dr. Stilphen's Performance
  • Trustworthiness
  • Explains condition(s) well
  • Answers Questions
  • Time well spent
Office & Staff Performance
  • Scheduling
  • Office environment
  • Staff friendliness
  • Average wait time
    16 to 30 minutes
Patient Comments (2)
Los Angeles, CA |
During my first visit Dr Stilphen kept me waiting for over an hour. I asked his staff if he was still coming to see me and when he finally did get to me he asked if I had somewhere to go! I saw his NP another time and she did not know why I was there. A nurse had the wrong symptoms. Then two times the NP accused me of meeting her before which was not true. I had never met this NP. The NP did not verify my DOB so I wonder if she had my chart or another patients chart. I Will not go back!
San Luis Obispo, CA |
I would not recommend this physician to anyone. Here is why: 1. He spent 95% of my appointment time (about 10 minutes) talking in to his phone for voice to text for his charting which consisted of him holding my paperwork and reading my responses into the phone (which he should do on his own time- not during the appointment). 2. Fraudulent billing- he was with me for about 12 minutes (10 of which he spent charting). He billed for "more than 45 minutes" so he was able to charge a whole lot more.
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Now Accepting New Patients
Dr. Stilphen accepts 9 insurance carriers
  • Aetna
    Aetna HMO
    Choice Plus POS II
  • Blue Cross Blue Shield
    Blue Card PPO
  • Blue Cross Blue Shield of California
    Advantage Preferred DirectAccess Plus PPO
    Blue Cross Blue Shield of California PPO
    Select Plus HMO
    Select PPO
  • Blue Shield of California
    Access Plus Savenet
    Local Access Plus HMO
  • Cigna
    Cigna HMO
    Cigna PPO
    Open Access Plus
  • First Health (Coventry Health Care)
    First Health (Coventry Health Care) PPO
  • Medi-Cal
  • Medicare
  • MultiPlan
    MultiPlan PPO
    PHCS Network PPO

*Please verify this information when scheduling an appointment.

Hospitals where Dr. Stilphen has admitting privileges

French Hospital Medical Center
1911 Johnson Ave
San Luis Obispo, CA 93401
View Hospital Profile
Arroyo Grande Community Hospital
345 S Halcyon Rd
Arroyo Grande, CA 93420
View Hospital Profile
Sierra Vista Regional Medical Center
1010 Murray Ave
San Luis Obispo, CA 93405
View Hospital Profile