Accepting new patients

Dr. Thomas Guyn, MD

Internal Medicine ·  Male · Age 66

Dr. Guyn

Northern California Medical Assocs

3536 Mendocino Ave Santa Rosa, CA 95403

Make an Appointment

Show Phone Number


Dr. Thomas Guyn, MD is an internal medicine specialist in Santa Rosa, CA and has been practicing for 33 years. He graduated from Universita Campus Bio-Medico Di Roma, Facolta Di Medicina E Chirurgia in 1983 and specializes in internal medicine and geriatric medicine.


Insurance Check

Search for your insurance provider

Dr. Guyn accepts

Accepted insurance can change. Please double-check when making an appointment.

(707) 575-6033

Dr. Guyn accepts the following insurance:

Blue Cross Blue Shield
Blue Card PPO
Blue Cross Blue Shield of California
Blue Cross Blue Shield of California PPO
First Health (Coventry Health Care)
First Health (Coventry Health Care) PPO

Background Check

No malpractice claims found for California
No disciplinary actions found for the years we collect data
No board actions found for the years we collect data
Learn more about background checks

Experience Check

Check if Dr. Guyn treats your condition or procedure

Dr. Guyn's conditions and procedures:

  • Abdominal Disorders
  • Abdominal Pain
  • Abnormal Thyroid
  • Abscess Incision and Drainage
  • Abscess or Cyst Drainage or Aspiration
  • Abscess or Fluid Incision and Drainage
  • Achilles Tendinitis
  • Acidosis
  • Acne
  • Actinic Keratosis
  • Acute Bronchitis
  • Acute Deep Vein Thrombosis (DVT)
  • Acute Laryngitis
  • Acute Pharyngitis
  • Acute Postoperative Pain
  • Acute Sinusitis
  • Acute Tonsillitis
  • Acute Upper Respiratory Infection
  • Acute Venous Embolism Thrombosis
  • ADHD and-or ADD
  • Advance Directive End of Life Planning
  • Alkalosis
  • All Headaches (incl. Migraine)
  • Allergic Reaction
  • Allergic Rhinitis
  • Allergy Shots
  • Allergy Skin Testing
  • Allergy Testing
  • Anal Disorders
  • Anemia
  • Anemia and Iron Deficiency Screening
  • Animal Allergies
  • Ankle Sprain and Achilles Tendon Sprain or Rupture
  • Ankle Sprains and Strains
  • Anxiety
  • Arthritis
  • Arthritis of the Elbow
  • Asthma
  • Asymptomatic Post-Menopausal Status
  • Ataxia
  • Atherosclerosis
  • Athlete's Foot
  • Autonomic Disorders
  • Back Pain
  • Bacterial Sepsis
  • Balanoposthitis
  • Bedsores
  • Bell's Palsy
  • Benign Chronic Pain Syndrome
  • Biopsy
  • Bladder Diseases
  • Bladder Infection
  • Blood Disorders
  • Blood in Urine (Hematuria)
  • Boil
  • Bone Disorders
  • Breast Diseases
  • Breast Pain
  • Breath Testing
  • Bronchitis
  • Bronchospasm
  • Bruise of Face, Scalp, or Neck
  • Bursitis
  • Calcium Metabolism Disorders
  • Canker Sore
  • Cardiac Catheterization (incl. Coronary Angiography)
  • Cardiac Imaging
  • Cardiac Myocardial Perfusion Imaging
  • Cardiovascular Stress Test
  • Carpal Tunnel Syndrome
  • Celiac Disease
  • Cellulitis
  • Chest CT (incl. Heart and Lungs)
  • Chest Pain
  • Cholesterol Screening
  • Chronic Deep Vein Thrombosis (DVT)
  • Chronic Fatigue Syndrome
  • Chronic Neck Pain
  • Chronic Pain
  • Chronic Sinusitis
  • Chronic Venous Embolism Thrombosis
  • Cluster Headache
  • Cold Sore
  • Confusion
  • Congestive Heart Failure
  • Constipation
  • COPD (Chronic Obstructive Pulmonary Disease)
  • Coronary Artery Disease (CAD)
  • Cough
  • Deep Vein Thrombosis (DVT)
  • Dehydration
  • Depressive Disorders
  • Dermatitis
  • Dermatitis Due to Drugs
  • Dermatitis Due to Substances Taken Internally
  • Diabetes
  • Diabetes Mellitus, Secondary
  • Diabetes Screening
  • Diabetes Type 1
  • Diabetes Type 2
  • Diabetes With Renal Manifestations
  • Diabetic Polyneuropathy
  • Diarrhea
  • Difficulty With Walking
  • Diverticulosis, Intestinal
  • Dizziness
  • Dry Skin
  • Dysentery
  • Dysphagia
  • Dysthymia (Chronic Depression)
  • Dysthymia and Cyclothymia (Mood Disorders)
  • Ear Ache
  • Ear Disorders
  • Earwax Buildup
  • Echocardiography
  • Elbow Injuries
  • Electrocardiogram (EKG)
  • Emphysema
  • Enlarged Prostate (BPH)
  • Enteritis
  • Erectile Dysfunction
  • Esophageal Diseases
  • Esophagitis
  • Essential Tremor
  • Excessive Sweating
  • Fecal Occult Blood Test for Colorectal Cancer
  • Fever
  • Fibromyalgia
  • Foot Conditions
  • Foot Sprain
  • Gait Abnormality
  • Ganglion Cyst
  • Gas-Bloat Syndrome
  • Gastritis
  • Gastroesophageal Reflux Disease (GERD)
  • Gastrointestinal Diseases
  • Gastroparesis
  • Gonorrhea Screening
  • Gout
  • Hair Loss
  • Hammer Toe
  • Headache
  • Heart Disease
  • Heart Palpitations
  • Hemorrhoids
  • Hepatitis Screening
  • Herpes Simplex Infection
  • Herpes Zoster Without Complication
  • Hidradenitis
  • High Cholesterol
  • HIV Screening
  • Hives
  • Hoarse Voice (Dysphonia)
  • Hypercalcemia
  • Hyperkalemia
  • Hyperlipidemia
  • Hypertension
  • Hypertensive Chronic Kidney Disease
  • Hypoglycemia
  • Hypokalemia
  • Hypotension
  • Hypotension (Excluding Maternal)
  • Hypothyroidism
  • Immunization
  • Incision and Removal of Foreign Object
  • Indigestion
  • Influenza (Flu)
  • Insomnia
  • Intertrigo
  • Iron Metabolism Disorders
  • Irritable Bowel Syndrome
  • Itchy Skin
  • Jock Itch
  • Joint Injection
  • Joint Pain
  • Knee Disorders
  • Knee Sprain
  • Lactose Intolerance
  • Laryngitis
  • Larynx Conditions
  • Lateral and Medial Epicondylitis (Tennis and Golf Elbow)
  • Leg and Foot Ulcers
  • Limb Cramp
  • Limb Pain
  • Limb Swelling
  • Limb Swelling Caused by Fluid Overload
  • Lipid Disorders
  • Liver Function Test
  • Low Back Pain
  • Low Blood Oxygen Level
  • Lyme Disease
  • Magnesium Metabolism Disorders
  • Malaise and Fatigue
  • Malnutrition
  • Menopausal and Postmenopausal Disorders
  • Menstrual Disorders (incl. Dysmenorrhea)
  • Migraine
  • Mineral Metabolism Disorders
  • Moles (Benign Skin Lesions)
  • Motion Sickness
  • Muscle Spasm
  • Muscle Weakness
  • Nail and Nail Bed Infection
  • Nausea
  • Neck Muscle Strain
  • Neurogenic Bladder
  • Nighttime Urination (Nocturia)
  • Non-Alcoholic Fatty Liver Disease
  • Noninfectious Gastroenteritis and Colitis
  • Nosebleed
  • Obesity
  • Osteoarthritis
  • Osteoarthritis of Ankle and Foot
  • Osteoarthritis of Hand or Wrist
  • Osteoarthritis of Hands
  • Osteoarthritis of Hip
  • Osteoarthritis of Hip and Thigh
  • Osteoarthritis of Knee
  • Osteoarthritis of Shoulder
  • Osteopenia
  • Osteoporosis
  • Osteoporosis Screening
  • Otitis Media
  • Outer Ear Infection
  • Overweight
  • Painful Urination (Dysuria)
  • Pap Smear
  • Paracentesis
  • Partial Lung Collapse
  • Patellofemoral Pain Syndrome or Knee Pain
  • Peptic Ulcer
  • Perimenopause
  • Peripheral Autonomic Neuropathy
  • Peripheral Nerve Disorders
  • Peripheral Vascular Disease (PAD, PVD)
  • Pharyngitis
  • Phlebitis and Thrombophlebitis
  • Physical Examination
  • Pinkeye (Conjunctivitis)
  • Pneumonia
  • Pollen Allergy
  • Polymyalgia Rheumatica (PMR)
  • Polyneuropathy
  • Prostate Cancer Screening
  • Prostatitis
  • Pulmonary Disease
  • Pulmonary Function Test
  • Radiculopathy (Not Due to Disc Displacement)
  • Rash
  • Raynaud's Disease
  • Reflux Esophagitis
  • Restless Leg Syndrome
  • Rib Fracture
  • Ringworm
  • Rosacea
  • Salivary Gland Stones and Inflammation
  • Sarcoidosis
  • Sciatica (Not Due to Disc Displacement)
  • Sepsis
  • Sexually Transmitted Diseases (STDs)
  • Sexually Transmitted Infections Screening
  • Shingles
  • Shortness of Breath
  • Shoulder Disorders
  • Shoulder Tendinitis and Tenosynovitis
  • Sinusitis
  • Skin Infections
  • Sleep Apnea
  • Sleep Disorders
  • Sleep-Related Leg Cramp
  • Smoking Cessation Counseling
  • Sore Throat
  • Spirometry
  • Spondylosis
  • Sprains and Strains (incl. Muscle Tear)
  • Stomach Diseases
  • Swine Flu
  • Symptomatic Menopause
  • Syncope
  • Syphilis Infections
  • Syphilis Screening
  • Testicular Dysfunction
  • Thoracentesis
  • Thrombosis
  • Thyroid Disease
  • Thyroid Screening
  • Tinnitus
  • Tobacco Use Disorder
  • Tonsillitis
  • Transient Ischemic Attack (TIA)
  • Tremor
  • Ulcer
  • Urinalysis
  • Urinary Disorders
  • Urinary Incontinence
  • Urinary Stones
  • Urinary Tract Infection (UTI)
  • Vaccination
  • Vaginitis and-or Vaginosis
  • Venous Embolism and Thrombosis
  • Venous Insufficiency
  • Vertigo
  • Viral Enteritis
  • Viral Infection
  • Vitamin D Deficiency
  • Wellness Examination
  • Wheezing
  • Yeast Infections

About Me

Care Philosophy

Dr. Thomas Guyn is an experienced internal medicine physician who has over 26 years experience working with patients in private practice, consulting and most recently as a hospitalist. He is now part of the elite team of Internists at Northern Califo...

Specialties

  • Internal Medicine
  • Geriatric Medicine

Board Certifications

Education

2006
University Of Lancaster Away Program, Master Of Arts In Values and The Environment
1986
New Britain Genl Hospital
Residency Hospital
1984
Worcester City Hospital
Internship Hospital
1983
Universita Campus Bio-Medico Di Roma, Facolta Di Medicina E Chirurgia
Medical School
1975
California State University Chico
Undergraduate School
2006
1986
1984
1983
1975

Awards

Dr. Guyn's Reviews

Likelihood to recommend Dr. Guyn

4.7

Based on 29 reviews

5 Stars
86.20689655172414%
(25)
4 Stars
6.896551724137931%
(2)
3 Stars
0%
(0)
2 Stars
0%
(0)
1 Star
6.896551724137931%
(2)

Leave a review

How likely are you to recommend
Dr. Guyn?
(Select your rating)
Average Reported Wait Time
  • Under 10 minutes
Dr. Guyn's Performance
  • Trustworthiness
  • Explains condition(s) well
  • Answers questions
  • Time well spent
Office & Staff Performance
  • Scheduling
  • Office environment
  • Staff friendliness

Be the first to leave a comment

How was your experience with Dr. Guyn?

Locations

Affiliated Hospitals

Check the quality of care at hospitals where Dr. Guyn treats patients.

Learn more