Our Team · Board-Certified Physicians Only
The Autoimmune Experts Who Listen.
Every visit is with an MD — a medical doctor. Board-certified experts in rheumatology, menopause & metabolic medicine, and pediatric rheumatology. Real credentials, real listening — and one goal: your remission.
- 4 physicians · 8 board certifications
- Covering 20 US states
- 186 five-star reviews · 5.0★
Our Team · Board-Certified Physicians Only
Real credentials. Real listening. Real remission.
Diana Girnita, MD, PhD, FACR
Founder & CEO · Rheumatology & Internal Medicine
Founder · DSC Alliance
A physician-scientist with 20+ years of experience: PhD in immunology, postdoctoral research at Harvard, NIH-funded research at the University of Pittsburgh, and rheumatology fellowship at the University of Cincinnati — plus training in regenerative and integrative rheumatology and the MBSR mindfulness program at the University of Massachusetts, founded by Dr. Jon Kabat-Zinn. Author of two books and 17 peer-reviewed papers (490+ citations), she educates millions on autoimmune disease, menopause, metabolic inflammation, and GLP-1 medications — semaglutide (Ozempic®, Wegovy®) and tirzepatide (Mounjaro®, Zepbound®) — including their emerging anti-inflammatory effects. 300K+ followers across platforms, 40M+ views. Featured in The New York Times, NPR, Medscape, HealthCentral, and KevinMD.
Focus: rheumatoid arthritis & remission · lupus · psoriatic arthritis · gout · complex undiagnosed autoimmune disease · integrative & regenerative rheumatology
Vishnuteja Devalla, MD
Rheumatology & Internal Medicine
Mirela Titianu, MD
Internal Medicine · Menopause, Obesity & Lifestyle Medicine
ROC Partner Network
Saumya Vinod Joshi, MD, MS, RhMSUS
Pediatric Rheumatology · Founder, Joshi Pediatric Rheumatology
The Care Team Behind Your Physicians
The people who make it seamless.
Darren Joy, RPh
Practice Manager
Pearl Bonsucan
Patient Care Coordinator
About Our Team
Questions patients ask about our physicians.
Who will treat me at Rheumatologist OnCall?
Are all Rheumatologist OnCall physicians board-certified?
Who is Dr. Diana Girnita?
Who is Dr. Vishnuteja Devalla?
Who is Dr. Mirela Titianu?
Dr. Mirela Titianu, MD is board-certified in Internal Medicine, Obesity Medicine, and Lifestyle Medicine, a NAMS Certified Menopause Practitioner, and a Certified Nutrition Coach (NASM). She leads our Women’s Hormone, Autoimmune, Metabolic & Sexual Health Program — treating the intersection of menopause, hormones, weight, and autoimmune disease — by telehealth in California, Florida, and Oregon. She has been featured on NBC, and became a menopause specialist because she was a patient first.
Who is Dr. Saumya Joshi?
Do you treat children and teenagers?
Will I see the same doctor at every visit?
Who handles the non-medical side of my care?
Your First Step
Our physicians listen — and get you to lasting remission.
Frequent asked questions
Who is part of the Rheumatologist OnCall team?
The Rheumatologist OnCall team includes Dr. Diana Girnita, MD, PhD, FACR, Dr. Vishnuteja Devalla, MD, Dr. Mirela Titianu, MD, Darren Joy, RPh, and Pearl Bonsucan, Patient Care Coordinator. Together, the team supports patients with arthritis, autoimmune conditions, menopause-related concerns, weight management, lifestyle medicine, and patient care coordination.
Who is Dr. Diana Girnita, MD, PhD, FACR?
Dr. Diana Girnita is the Founder and CEO of Rheumatologist OnCall. She is board certified in Internal Medicine and Rheumatology and is dedicated to making arthritis and autoimmune care more accessible through telehealth and direct-pay specialty care.
What is Dr. Diana Girnita known for?
Dr. Girnita is known for her work in arthritis and autoimmune care, telehealth rheumatology, nutrition-focused support, direct-pay medicine, patient education, and whole-body rheumatology. Her educational content has reached millions of views, and her work has been featured in major medical and media outlets.
Who is Dr. Vishnuteja Devalla, MD?
Dr. Vishnuteja Devalla is a board-certified rheumatologist at Rheumatologist OnCall. He is an expert in treating arthritis and autoimmune diseases and has a special interest in gut health, chronic inflammation, and complex rheumatology care.
What is Dr. Devalla’s training background?
Dr. Devalla completed Ivy League rheumatology training at Dartmouth-Hitchcock Medical Center. He is board certified in Rheumatology and is licensed in multiple U.S. states, allowing him to support eligible patients through virtual rheumatology consultations.
Who is Dr. Mirela Titianu, MD?
Dr. Mirela Titianu is a physician at Rheumatologist OnCall who is board certified in Internal Medicine, Obesity Medicine, and Lifestyle Medicine. She is also a Menopause Society Certified Practitioner and a Certified Nutrition Coach through NASM.
What does Dr. Mirela Titianu help patients with?
Dr. Titianu helps patients with menopause, perimenopause, hormone-related symptoms, obesity medicine, lifestyle medicine, sustainable weight loss, nutrition, and improved health outcomes for people living with arthritis and autoimmune diseases.
Who is Darren Joy, RPh?
Darren Joy, RPh, is the Practice Manager and Medical Assistant at Rheumatologist OnCall. The page describes Darren as bringing warmth, efficiency, organization, and genuine care to the patient experience and daily practice operations.
Who is Pearl Bonsucan?
Pearl Bonsucan is the Patient Care Coordinator at Rheumatologist OnCall. Her role is to listen to patients, understand their story, and help them feel supported while navigating autoimmune and arthritis-related health concerns.
What makes the Rheumatologist OnCall team different?
The team focuses on personalized, accessible, direct-pay rheumatology care. The page emphasizes that patients are treated as people, not diseases, with direct physician communication, transparent pricing, telehealth access, and support that blends medical treatment with nutrition, mindfulness, and physical activity.
Does Rheumatologist OnCall offer telehealth visits?
Yes. Rheumatologist OnCall provides in-person and telehealth visits across its service area. The page highlights telehealth as part of the practice’s mission to make arthritis and autoimmune care more accessible when patients need it.
Where is Rheumatologist OnCall located?
Rheumatologist OnCall is located at 19712 MacArthur Blvd, Suite 100, Irvine, CA 92612. The practice also provides telehealth care for eligible patients depending on location and state availability.
Has Rheumatologist OnCall been featured in the media?
Yes. The page states that Rheumatologist OnCall and Dr. Diana Girnita have been featured in outlets such as The New York Times, NPR, Medscape, KevinMD, and other medical and health platforms.
Has Dr. Diana Girnita written books?
Yes. The page lists several books and resources by Dr. Girnita, including “Thriving with Rheumatoid Arthritis,” “The Complete Gout Management and Nutrition Guide,” and the “Rheumatoid Arthritis Journal.”
How can I book an appointment with the Rheumatologist OnCall team?
Patients can take the first step by using the booking option on the website or by calling the appointment phone number listed on the page. The team provides expert care for arthritis, autoimmune conditions, and related health concerns through in-person and virtual consultations.
