Kidney health
Protecting your kidney function and slowing disease progression, from early warning signs through advanced stages.
Nephrology & Internal Medicine · Madera & Fresno, CA
Expert Kidney Care for the Central Valley
Our fellowship-trained, board-certified nephrologists provide compassionate, comprehensive renal care — from our Madera and Fresno clinics and the region's major hospitals.
Referred by your doctor? Call us — we likely already have your paperwork.
What we can help with
Noticing any of these? We can help.
These are the most common reasons people come to see us. If any sound familiar, you're in exactly the right place.
Blood pressure that won't behave
Resistant & renovascular hypertension
Protein or blood in your urine
Proteinuria & hematuria
Swelling in your legs or face
Fluid retention & edema
Kidney function flagged on labs
Elevated creatinine or low eGFR
Chronic kidney disease
CKD stages 1–5
Diabetes affecting your kidneys
Diabetic kidney disease
Sodium or potassium out of balance
Electrolyte disorders
A sudden kidney problem in hospital
Acute kidney injury (AKI)
Preparing for dialysis
Hemodialysis & peritoneal options
Not sure where you fit? That's okay — call (559) 661-1965 and we'll figure it out together.
See all the reasons people come inClinical Care
Care for every stage of kidney health
Living well on dialysis
Guiding you through every step of dialysis — choosing the right type, preparing access, and ongoing physician oversight.
Blood pressure & heart health
Getting hard-to-control high blood pressure under control, and managing the fluid and mineral balance your kidneys regulate.
Hospital care
If you're hospitalized with a sudden kidney problem, our physicians consult directly with your hospital care team.
Physicians & Experience
Doctors your doctor trusts
Primary care physicians and hospitals across the Central Valley send their patients to Dr. Masood and Dr. Siddiqui.
Dr. Sheikh Mohammad Masood, MD
President & Nephrologist
Dr. Sheikh Mohammad Masood, MD, is the founding president of Kidney Specialist Inc. With specialized fellowship training in Nephrology from the LSU Health Sciences Center, Dr. Masood provides compassionate, comprehensive care for patients with complex renal diseases, hypertension, and dialysis needs throughout Madera and the Central Valley.
CLINICAL FOCUS
Credentials, training & hospital privileges
Dr. Mohammed Muhibbulla Siddiqui, MD
Nephrologist & Clinical Specialist
Dr. Mohammed M. Siddiqui, MD, brings deep clinical expertise in nephrology, acute renal care, and hospital medicine to Kidney Specialist Inc. Active in medical research, Dr. Siddiqui specializes in advanced chronic kidney disease management, acute renal injury, and resistant hypertension.
CLINICAL FOCUS
Credentials, training & hospital privileges
Patient Education & Guides
Clear Guidance for Everyday Kidney Health
Grounded medical guidance on understanding lab results, making safe dietary choices, and slowing kidney disease progression.
Lab Interpretation Understanding eGFR Below 60: What It Means
A clear, non-alarmist guide to what reduced filtration means and the modern steps we take to protect your kidneys.
Kidney Nutrition Smart Food Swaps & Potassium Safety
Kidney-friendly swaps for Central Valley favorites, safe blood potassium ranges (3.5–5.0), and salt substitute alerts.
Diabetes & Kidneys HbA1c to Blood Sugar Converter
Interactive clinical tool translating your HbA1c percentage to estimated daily average glucose levels (mg/dL).
Frequently Asked Questions
Common Questions About Your Care
Here are clear answers to questions patients ask us most about kidney care, appointments, and insurance.
Do I need a referral to be seen?
Many insurance plans require a referral from your primary care physician before seeing a specialist. If your doctor referred you, we've likely already received the paperwork by fax. If you're unsure, call our office at (559) 661-1965 and our staff will check your plan's requirements with you.
Does anyone in the office speak Spanish?
Yes. Our entire staff speaks Spanish, so you and your family will always have someone to explain things in Spanish — when you call, when you arrive, during your appointment, and afterward. The physicians see patients in English, and a staff member is always there to translate and make sure you understand your care plan, your medications, and your results. The doctors also speak Urdu, Hindi, and Punjabi.
What should I bring to my first appointment?
Please bring a valid photo ID, your insurance card(s), a complete list of your current medications with dosages (including over-the-counter drugs and supplements), any referral paperwork from your doctor, and copies of recent lab results or kidney imaging if you have them. Don't worry if you're missing something — our staff can request records from your other doctors.
Clinic Locations & Hours
Two Convenient Central Valley Offices
Personalized kidney care in Madera and Fresno with our dedicated physicians, fully bilingual staff, and one shared phone number.
Primary Clinic Closed Madera Clinic
This is our main office, and where most of our patients are seen. It's open Monday through Friday, and the same phone number reaches a real person whether you're calling to book, to ask about coverage, or to have records sent over.
Address 451 E Almond Ave, Suite 101
Madera, CA 93637
Madera, CA 93637
Free parking directly at entrance When we're open
NE Fresno Closed Fresno Clinic (Inside Trust Clinic)
Our Fresno office is in the northeast of the city, inside Trust Clinic on N. Willow Ave. It's the same practice and the same physicians as Madera — and the same phone number to reach either one.
Address 6777 N. Willow Ave
Fresno, CA 93710
Fresno, CA 93710
Free parking directly at entrance When we're open