Fresno : 5043 E. Cesar Chavez Blvd., Suite 104, Fresno, CA 93727
Fresno North: 7407 North Cedar Ave Suite 102 Fresno CA 93720
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Merced Office: 105 W El Portal Dr, Suite B, Merced, CA 95348
Fresno Office: 5043 E Cesar Chavez Blvd, Suite 104, Fresno, CA 93727
Merced Office: 105 W El Portal Dr, Suite B, Merced, CA 95348

Allergist in Merced – Sierra Allergy Asthma & Sinus Center

Trusted allergy & asthma clinic in Merced, led by Dr. Muhammad Hassan Bashir, serving Merced, Franklin, Loughborough, McNamara, Bear Creek & Central California. Find lasting relief from seasonal allergies, asthma attacks & sinus problems today.

Why choose our allergist in Merced

When allergy symptoms interrupt your sleep or breathing, you need an experienced allergist near Merced who can uncover the cause and deliver results that last.
At Sierra Allergy Asthma & Sinus Center, we combine science, technology, and compassion to bring patients across the Central Valley expert care in one convenient location.

Led by board-certified allergist Dr. Bashir, our team provides advanced diagnostics, personalized allergy and asthma treatment plans, and a caring environment for both adults and children.

Conditions we treat at Merced allergy clinic

We diagnose and treat:

  • Seasonal & environmental allergies (pollen, dust mites, mold, pet dander)
  • Asthma & chronic cough
  • Chronic sinusitis & nasal congestion
  • Food & drug allergies
  • Eczema, hives, and skin allergies
  • Insect bite and sting reactions
  • Contact dermatitis & immune disorders


Each visit is customized to help you breathe better and live healthier — wherever you are in Merced County.

Our services: complete allergy care in Merced

We offer complete allergy and asthma care designed for lasting relief such as:

Allergy testing & diagnosis

We provide comprehensive allergy testing in Merced, including skin prick, intradermal, and blood (IgE) tests to detect environmental, food, and drug triggers. Understanding the cause of your symptoms lets us create targeted, long-term solutions.

Asthma care & management

As a leading asthma specialist in Merced, Dr. Bashir performs lung function (spirometry) tests and tailors treatment plans that may include inhaler training, controller medication, and trigger avoidance strategies.

Sinus & ENT-related allergy treatment

Many chronic sinus and ENT issues stem from allergies. Our Merced sinus and allergy clinic treats inflammation, pressure, and nasal blockage by targeting underlying allergens.

Immunotherapy (allergy shots & drops)

Our Merced immunotherapy clinic offers both allergy shots and sublingual immunotherapy to desensitize your immune system. Over time, this reduces allergic reactions and dependence on medications.

Food, drug & insect allergy management

We help patients manage food allergies, medication reactions and insect sting allergies safely. We create personalized plans and teach how to use epinephrine (EpiPen®) if needed.

Why patients trust our Merced allergy clinic

Patients across Franklin, Loughborough, McNamara, Bear Creek and Central Valley choose Sierra Allergy Asthma & Sinus Center because we combine advanced medical expertise with genuine compassion.

Relief you can feel
clear sinuses, calmer breathing, and better sleep

Proven expertise
Dr. Bashir’s training from UCSF Fresno and Stanford

Complete family care
pediatric allergies to adult asthma

Trusted across the Central Valley
Merced, Atwater, Los Banos, Livingston & Turlock

Meet Dr. Muhammad Hassan Bashir – your Merced allergist

Dr. Bashir is a board-certified allergist and immunologist with over a decade of experience in allergy, asthma and immunology care. Trained at UCSF Fresno, Medical College of Wisconsin and Stanford University, he is known for his compassion and attention to detail.

Dr. Hassan Bashir - Sierra Allergy Asthma and Sinus Center Fresno

How to book an appointment

Take the first step toward lasting relief today.
Call (559) 369-4421 or request an appointment online at sierraallergy.com.
Our team will help you schedule a visit that fits your life — whether you’re in Merced, Atwater, Los Banos, Livingston, or the broader Central California area.

Areas we serve around Merced

Our Merced office welcomes patients from:
Franklin, Loughborough, McNamara, Bear Creek and Central Valley regions. We’re a short drive for families across the Central Valley region seeking trusted allergy and asthma care.

Merced Office Open on Saturdays