Urgent Care Providers
Colleen O'Sullivan, PA-C
I joined Lassen Medical Group in August 2009. I received my B.S. Biology from Colorado State University 1998; Certificate of Physician Assistant Studies – Red Rocks College 2001; M.S. Medical Science. – St. Francis University 2001. I believe in patient education. Understanding empowers the patient to make decisions and take responsibility for their own health and wellness.

Physicians Assistant - Certified
- Joined Lassen Medical Group:
- - September 2009
- Licensing:
- - California Physician Assistant License
- Experience
- 8 years – Rural Primary Care, Urgent Care, Emergency Medicine
- Education:
- - B.S. Biology - Colorado State University 1998
- Certificate of Physician Assistant Studies – Red Rocks College 2001
- B.S. Biology - Colorado State University 1998
- M.S. Medical Science. – St. Francis University 2001 - Personal Interests:
- - Bicycling, hiking, dogs, travel, scuba diving, skiing, archery
Location: Rotates Between Red Bluff and Cottonwood Urgent Cares
Contact: Red Bluff 527-0414
Cottonwood 347-3418
Urgent Care Hours - Red Bluff
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Sunday
-
Monday
8:00 am
8:00 pm
-
Tuesday
8:00 am
8:00 pm
-
Wednesday
8:00 am
8:00 pm
-
Thursday
8:00 am
8:00 pm
-
Friday
8:00 am
8:00 pm
-
Saturday
8:00 am
6:00 pm
Urgent Care Hours - Cottonwood
-
Sunday
-
Monday
8:00 am
6:00 pm
-
Tuesday
8:00 am
6:00 pm
-
Wednesday
8:00 am
6:00 pm
-
Thursday
8:00 am
6:00 pm
-
Friday
8:00 am
6:00 pm
-
Saturday
Lassen Medical Group participates with the Language Line interpreting service, making communication possible in hundreds of languages to include Spanish, Mandarin, Hindi, Polish, Farsi, Italian, Hmong, Finnish, Luganda
- Departments
- • Family Practice/
- Osteopathic Medicine
- • Urgent Care/Walk-In Clinic
- • Pediatrics
- • Internal Medicine
- • Dermatology
- • Support Services
- Patient Center
- Request an Appointment
- New Patients
- What to Bring
- Find a Physician
- Forms
- Changes In Medicare
- Locations
- 2450 Sister Mary Columba Dr.
- Red Bluff, CA 96080
- Phone: 530-527-0414
- Google Map
- 20833 Long Branch Drive
- Cottonwood CA 96022
- Phone: 530-347-3418
- Google Map
- Doctor on Call
- Lassen Medical Group Has a Doctor On Call 24 hours a day, 7 days a week in the following specialties:
- • Family Medicine
- • Internal Medicine
- • Pediatrics
- After Hours
- For after-hour urgent healthcare needs, our patients can call one of our Answering Services:
- • Red Bluff - 530-529-7237
- • Cottonwood - 530-242-4295
- If it is an emergency, dial 911.





