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Attention patients, effective November 1, 2023, Epic Care will enforce a cancellation & no-show policy. For more information, please talk to your local office.

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Scam Alert: Beware of scam calls pretending to be from Epic Care or your insurance. We'll never ask for personal or financial info by phone unexpectedly. If in doubt, hang up and call us directly at (925) 255-1066. Report suspicious calls to the FTC or local police.

Attention patients, effective November 1, 2023, Epic Care will enforce a cancellation & no-show policy. For more information, please talk to your local office.

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Castro Valley

Welcome to Castro Valley

4.9 out of 5

(2,255 ratings, 1,073 comments)

20400 Lake Chabot Road, Suite 102, Castro Valley, CA 94546

Telephone: (510) 247-9227

Fax: (510) 247-9241

Office Hours: Monday - Friday 8:00 AM - 5:00 PM

Services Offered

General Surgery
Infusion Services
Internal Medicine
Medical Oncology
Radiation Oncology
Laboratory Services

Epic Care Providers

Family & Internal Medicine

Deepak Dhawan, MD

General Surgery

Sara J. Reinganum, MD, FACS

Low Dose Radiation Therapy

Medical Oncology & Hematology

Neha DeSouza, MD

Shelly Gupta, MD

Qaiser Niaz, MD

Srikanth Reddy, MD

Radiation Oncology

Verified Patient Reviews

The following ratings and reviews are based on verified feedback collected from independently administered patient experience surveys. The ratings and comments submitted by patients reflect their own views and opinions. Patient identities are withheld to ensure confidentiality and privacy.

5

1,043 comments

4

28 comments

3

1 comment

2

0 comments

1

1 comment

4.9 out of 5 (2,255 ratings, 1,073 comments)

Jul 18, 2025

Srikanth Reddy, MD

Great doctor!

Jul 17, 2025

Qaiser Niaz, MD

I'm receiving great care from Dr. Niaz & his staff

Jul 15, 2025

Qaiser Niaz, MD

I would happily recommend Dr Niaz to anyone looking for an Oncologist in my area.

Jul 15, 2025

Deepak Dhawan, MD

Good service

Jul 14, 2025

Deepak Dhawan, MD

Great family doctor

Verified Ratings and Reviews Powered by Ratings.MD

Schedule Your Visit Today

If you have questions about our providers or you’d like to schedule an appointment, contact us today! You can also reach out to us on our contact page. Our team of specialists are committed to using the latest breakthroughs and scientific innovations to deliver comprehensive treatment tailored to your needs.

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July is UV Safety Month! Properly protecting your

July is UV Safety Month! Properly protecting your skin from the sun helps lower your risk of sun damage and skin cancer. Are you using sunscreen the right way? Check out these tips! ☀️🧴

#UVSafetyMonth #SunSafety #SkinProtection #SPF #SunscreenTips #HealthySkin #SkinCancerAwareness #SunSmart #EpicCare

Thank you to everyone who took part in this past w

Thank you to everyone who took part in this past weekend’s Relay for Life of the Delta! Together, we helped raise more than $41,000 to advance the American Cancer Society’s vision to end cancer as we know it, for everyone.

Relay For Life celebrates survivors, honors caregivers, remembers loved ones lost, and raises funds to ensure everyone can have the chance to prevent, detect, treat, and survive cancer.

A special shout-out to Jamie Rackley, Epic Care’s team captain and event lead, along with the rest of our dedicated Epic Care team members, family, and friends who gave their time, energy, and heart to this meaningful cause! 💜

#RelayForLifeOfTheDelta #RelayForLife #TeamEpicCare #EpicCare

Our Walnut Creek CyberKnife & Surgery team rocking

Our Walnut Creek CyberKnife & Surgery team rocking the color purple to celebrate Relay For Life and our Paint the Town Purple Week, because hope looks good on us!

We’re proud to support the American Cancer Society Relay For Life of the Delta happening this Saturday, July 12 and there’s still time to join us or donate!

Head to 👉 https://bit.ly/ECRelayDelta25 to support #TeamEpic 💜

#RelayForLife #RelayForLifeOfTheDelta #WhyIRelay #TeamEpic #HopeInAction #EpicCare #CancerAwareness #PaintTheTownPurple #CommunityStrong

You have to experience it! Join Epic Care for a s

You have to experience it! Join Epic Care for a special event: the American Cancer Society Relay for Life of the Delta THIS Saturday, July 12

Relay For Life is more than just an event—it’s a movement, a community of survivors, caregivers, volunteers, and participants all united by the belief that the future can be free from cancer. We’re proud to sponsor and be part of this powerful movement, working together to help end cancer as we know it, for everyone.

All funds raised through these events go to the American Cancer Society to support services and resources, including cancer research, advocacy, free rides to chemotherapy, and a 24/7 helpline.

To sign-up or donate to our team, visit our team pages: https://bit.ly/ECRelayDelta25

#RelayForLife #RelayForLifeOfTheDelta #Relay #WhyIRelay #Team #Hope #TeamEpic #EpicCare

Happy Independence Day!

🇺🇸 Happy Independence Day! 🇺🇸

Wishing everyone a joyful and safe holiday filled with celebration, connection, and community.

#IndependenceDay #FourthOfJuly #Celebrate #EpicCare

Are you a registered nurse who is passionate about

Are you a registered nurse who is passionate about helping others? If so, Epic Care is looking for qualified candidates—like you—to join our growing team. Explore current openings and learn more about career opportunities at Epic Care by clicking our careers 🔗 in our bio.

We look forward to connecting with you!

#WereHiring #HealthcareJobs #HealthcareCareers #BayArea #JobSearch #RN #RegisteredNurse #EpicCare

Today we recognize Juneteenth, a day commemorating

Today we recognize Juneteenth, a day commemorating the end of slavery in the United States. It is a celebration of freedom and resilience, and a reminder to continue working towards equality and social justice for all.

#Juneteenth #Freedom #EpicCare

June is Men’s Health Month! A powerful reminder

June is Men’s Health Month! A powerful reminder to prioritize your well-being.

Understanding your risk factors for conditions like cancer is an important step toward prevention and early detection.

Here are some common cancer risk factors that are often found in men. Talk to your physician about how to stay proactive and protect your health.

#MensHealthMonth #CancerAwareness #MensWellness #PreventCancer #KnowYourRisk #EarlyDectectionSavesLives #MensHealth2025 #HealthMatters #EpicCare

Today, we celebrate the many faces of fatherhood:

Today, we celebrate the many faces of fatherhood: the dads, stepdads, grandfathers, mentors, and father figures who all provide strength, love, and steady support in their own unique ways. We also recognize that this day can evoke a range of emotions, and whatever you’re feeling today is valid.

Father’s Day is an opportunity to honor the quiet acts, everyday sacrifices, and lasting impact of those who have helped shape our lives. No matter how this day finds you, we hope it brings gratitude and connection. Happy Father’s Day!

#FathersDay #HappyFathersDay #Fathers #Dads #FatherFigures #EpicCare

Shout-out to our Antioch team for delivering care

Shout-out to our Antioch team for delivering care that makes a lasting impression!

Whether it’s a warm smile at check-in or personalized attention from your doctor, this is what we strive for at every Epic Care location: personalized, compassionate care that puts patients first.

Thank you to our amazing patients for sharing your experiences and trusting us with your care.

#EpicCare #CommunityValues #ExceptionalHealthcare #PatientExperience #5StarCare #CompassionInAction

Proud To Be Sponsors Of

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