Expert Rheumatology
& Arthritis Care

Board-certified rheumatologists offering personalised
care for joint pain, autoimmune conditions, and osteoporosis

Board-Certified Rheumatologists

Our board-certified rheumatologists provide expert diagnosis and treatment for complex autoimmune and musculoskeletal conditions. With extensive clinical training and years of specialised experience, our physicians deliver trusted, evidence-based care for arthritis, lupus, osteoporosis, and other rheumatic diseases.

Personalised Treatment Plans

We understand that every patient is unique, with different goals and preferences for treatment. Our rheumatology specialists will work closely with you to develop the best treatment plan for your condition. We also offer many advanced treatment modalities, including ultrasound-guided joint injections, subcutaneous injections, and infusions in our state-of-the-art infusion centre.

State-of-the-art infusion center

Our state-of-the-art infusion centre is designed to deliver advanced treatments in a safe, comfortable, and patient-focused environment. Equipped with modern medical technology and staffed by experienced healthcare professionals, we ensure precise and efficient care. Patients benefit from personalised treatment plans, minimal wait times, and a relaxing atmosphere.

Serving the Inland Empire since 1978

Established in 1978, Arthritis Medical Clinic is a premier rheumatology practice dedicated to the care of rheumatic autoimmune conditions, arthritis, and osteoporosis. We are proud to offer two convenient locations in Riverside and La Sierra.

The Healing Place for Rheumatology Care

Dr Babak Zamiri, M.D., FACR 

Dr Babak Zamiri, M.D., FACR, is a highly experienced rheumatologist dedicated to diagnosing and treating complex autoimmune and musculoskeletal conditions. As a Fellow of the American College of Rheumatology, he has extensive training in managing diseases such as rheumatoid arthritis, lupus, osteoporosis, psoriatic arthritis, and other inflammatory joint disorders.

Dr Zamiri takes a personalised approach to patient care, carefully evaluating each patient’s symptoms, medical history, and lifestyle factors to develop tailored treatment plans. 

Meet our expert Doctors

Dr. Nayef Kazzaz

Dr. Nayef
Kazzaz

M.D., FACR 

Dr. Asbat Hasan Bio

Dr. Asbat M.
Hasan

M.D., FACR 

Ryanne A
McClellan

Nurse Practitioner 

What is Arthritis?

Arthritis is not just one disease. It is a broad medical term used to describe more than 100 different arthritis conditions that affect the joints, muscles, and surrounding tissues. Many types of arthritis cause similar symptoms, including joint pain, stiffness, swelling, tenderness, and reduced range of motion. However, the cause of arthritis can be very different for each patient.

Some forms of arthritis, such as rheumatoid arthritis, lupus-related arthritis, and psoriatic arthritis, are caused by inflammation from the immune system. Other types, such as osteoarthritis, develop gradually from wear and tear on the joints over time. Because arthritis symptoms can overlap, getting an accurate diagnosis is important. Identifying the specific type of arthritis helps guide the right treatment plan, reduce joint damage, manage pain, and improve long-term mobility.

We Accept Most Insurances

Recent News

What is Rheumatology?

05/10/2025

What is Rheumatology?

05/10/2025

What is Rheumatology?

05/10/2025

Read Our Customer Reviews

Google Reviews

1,500+ Google Reviews

Stephanie Camacho

I have been a patient of DR HASSAN for close to two years now. Prior to being seen with him, I was not taken seriously about the pain I was experiencing due to my blood work all being ok, and simply being told nothing was medically wrong with me.

CHARLET YABLONSKY

The staff here has always been very professional, helpful, and courteous. Dr Farsi is wonderful. She is compassionate, thorough, and she listens to her patients (you don’t find that too much anymore, if at all). I would recommend this facility to anyone with Rheumatoid or other related issues.

Tonja Acosta

I have been attending this clinic for nearly 1 year now. Dr Hasan is courteous, compassionate, attentive, and provides exceptional patient care. In addition to his qualifications, he doesn’t rush patients, listens to and answers all questions. I feel a collective and unified approach to my well-being. The staff are always responsive and professional at either location. I highly recommend this clinic for anyone who is seeking quality care. They exceed expectations and are appreciated by this patient.

Heather Cobb

I see Dr every 3 months and have always been heard and cared for. But I go to the infusion center 1 time a month, and those ladies are literally amazing! They care for us all with grace and beautiful moments. I feel seen and cared for every single visit!

S Medina

They are very professional and friendly. Make sure you are doing well while here for infusions, and that we always get to see the specialist within 5 minutes of the appointment time.

Amy Carrillo

Doctor Zamiri is the kindest Doctor I’ve ever had. He always spends a lot of time with me, answering all of my questions and showing a great deal of compassion toward me. I feel incredibly blessed to have found him. The entire office staff knows me by name and treats me with kindness every time I’m there.

Elevating Rheumatology Care to the Highest Standard of Excellence

We Are Accepting New Patients!

Have questions about Arthritis Treatment?

We’re here to help.

Explore our frequently asked questions for quick answers, or reach out if you need further assistance.

We’re here for all your questions.

What is arthritis?

Arthritis is a condition that causes inflammation and pain in the joints, which are the places where bones meet, such as the knees, hands, or hips. It can lead to stiffness, swelling, and difficulty moving the joint. There are many types of arthritis, but the most common are osteoarthritis, caused by wear and tear on joints, and rheumatoid arthritis, an autoimmune disease where the immune system attacks the joints.

 
 

There are more than 100 types of arthritis, but the most common include:

Osteoarthritis – caused by wear and tear on joint cartilage over time.
Rheumatoid arthritis – an autoimmune disease where the immune system attacks the joints.
Psoriatic arthritis – occurs in some people with psoriasis and causes joint inflammation.
Gout – caused by uric acid crystals building up in the joints, often affecting the big toe.
Lupus arthritis – joint inflammation related to the autoimmune disease lupus.
Ankylosing spondylitis – mainly affects the spine and can cause the vertebrae to fuse.
Juvenile arthritis – arthritis that occurs in children under age 16.

 
 

Common symptoms of arthritis include joint pain, stiffness, swelling, and reduced movement in the joints. Many people also experience warmth or redness around the joint and morning stiffness that improves with movement. Over time, arthritis can make joints harder to move and may cause weakness or tenderness in the affected area.

 
 

Arthritis can be caused by several factors depending on the type. Common causes include wear and tear on joints over time, autoimmune diseases where the immune system attacks the joints, buildup of uric acid crystals in the joints, and joint injuries or infections. Genetics, age, and obesity can also increase the risk of developing arthritis.

 
 

Arthritis Medical Clinic has two convenient locations in Southern California.