Our Providers

Armen Dikranian, MD

Male and Female Urology and Robotic Surgery

Dr. Armen Dikranian is a board-certified urologist and a founding partner for Huntington Urology Specialists, located in Pasadena, California. He is the Chief of Surgery at Huntington Hospital and the Medical Director of Robotic Surgery. He has previously served as the Chair of Urology at both Huntington Hospital and Methodist Hospital of Arcadia.

Dr. Dikranian attended the University of Southern California, graduating summa cum laude and Phi Beta Kappa with a degree in psychobiology and a minor in bioethics. He continued his educational pursuits at USC’s Keck School of Medicine, where he was elected into the prestigious Alpha Omega Alpha Honor Society.

Dr. Dikranian completed his two years of general surgery training and his four-year urology residency at the Kaiser Permanente Los Angeles Medical Center. During these six years, he gained extensive and comprehensive experience in the medical and surgical management of urologic diseases.

Dr. Dikranian has authored several articles and has presented his clinical research at domestic and international scientific meetings. He has a special interest in robotic surgery for cancer and reconstruction, female urology including treatment of incontinence and minimally invasive surgery for pelvic organ prolapse, and in the advanced treatment for prostate enlargement.

Outside of his professional career, Dr. Dikranian has been a member of the Tournament of Roses in Pasadena for over ten years. He serves on several boards, including the USC Keck School of Medicine Alumni Board and the Saint Mark’s School Board. He is married to Talin Dikranian, and they have three daughters. He is an avid long-distance hiker and an overall outdoor enthusiast.

Ramin Khalili, MD

General Urology, Urologic Oncology, Robotic and Laparoscopic Urologic Surgery

Dr. Ramin Khalili MD is a board-certified urologist and a founding partner of Huntington Urology Specialists located in Pasadena, California. He is an expert in urological surgery, advanced robotic, and minimally invasive techniques.

Dr. Khalili graduated an Angell Scholar, Summa Cum Laude, with a degree in electrical engineering from the University of Michigan, Ann Arbor. He received his master’s degree in electrical engineering and circuit design from the University of California at Berkeley, and then worked in development of innovative circuits and instrumentation in Silicon Valley.

Then, Dr. Khalili returned to academia and graduated with a Regents Scholarship from the David Geffen School of Medicine at UCLA in 1991. He was elected into the Alpha Omega Alpha medical honor society at UCLA. He completed his urological surgery residency at UCLA in 1997 and has been practicing urology in Pasadena ever since.

Dr. Khalili is affiliated with Huntington Hospital and has been a pioneer in bringing advanced urological techniques to his community. He was instrumental in performing the first brachytherapy and robotic surgeries at Huntington Hospital. He has served as the chief of urology for several terms.

Today, Dr. Khalili is a recognized expert in robotic-assisted nerve-sparing prostatectomy, producing excellent outcomes in early recovery, negative margins, continence, and potency. He specializes in minimally invasive techniques for treatment of benign prostate enlargement, stone disease, vasectomy male and female incontinence, including robotic pelvic floor reconstruction.

Dr. Khalili has always been a strong patient advocate who is compassionate and believes in individualized care, always applying his technical know-how to achieve the best quality of life for his patients. He realizes that optimal outcomes are only achieved when a patient’s team of health care providers tailor a unique treatment plan for the individual patient’s needs.

Outside of the office, Dr. Khalili loves spending time with his family, literature, classical music, and playing tennis.

Aaron M. Krug, MD

Genitourinary Reconstructions
Men’s Sexual Health & General Urology

Dr. Aaron Krug is a fellowship trained physician specializing in Genitourinary Reconstruction and Men’s Sexual Health. He is based in Pasadena, CA and is affiliated with Huntington Hospital.

Dr. Krug earned his Bachelor of Science degree from the University of Michigan, with a focus in Brain Behavior and Cognitive Science. He received his medical doctorate degree at USC’s Keck School of Medicine where he graduated with “Highest Distinction” and was inducted into the esteemed Alpha Omega Alpha Medical Honor Society.
Dr. Krug completed his Urologic residency at the Kaiser Permanente Los Angeles Medical Center where he developed a strong foundation in general urology as well as robotic and reconstructive urologic surgery.
After residency he continued his urologic training and completed a fellowship in Genitourinary Reconstruction, Prosthetics and Men’s Sexual Health under the mentorship of Dr. Allen Morey.

His clinical expertise includes male erectile dysfunction, urethral stricture disease, Peyronie’s disease, post-prostatectomy urinary incontinence, buried penis, and cancer survivorship.

Dr. Krug is dedicated to advancing patient care in all urologic areas and remains on the forefront of the latest techniques to provide the highest quality of care and improve patient outcomes.

Outside of his medical practice, Dr. Krug enjoys spending quality time with family and friends, outdoor activities with his dogs, watching college sports, playing golf, and cooking.

Melissa Katigbak, MPA, PA-C

Physician Associate

Melissa Katigbak, MPA, PA-C is a nationally board-certified and California licensed physician associate specializing in general urology.

Melissa is an avid believer that providing access to healthcare requires active participation in the community. She completed her undergraduate studies at the University of California, San Diego where she obtained her Bachelor of Science degree in Biochemistry/Cell Biology. During her time in San Diego, Melissa took an active role in the community as one of the co-founders of Kaibigang Pilipino’s Community Outreach to Realize Empowerment, an organization that provides services to under-resourced high schools. Her sense of community importance carried on with her as she pursued her Master of Physician Assistant degree at Eastern Virginia Medical School where she participated in organizations that provided everyday essentials and ensured the needs of the senior community were met in the Norfolk community. After obtaining her master’s degree, Melissa aspired to work in a field where she felt she was most needed.

“Urology is often an overlooked field to the everyday person and issues involving the genitourinary tract is a not something that is talked about until it becomes a problem. At that point, these issues have such a profound effect on people’s quality of life and I understand that it’s not always easy to talk about. My goal is to allow patients to speak about their concerns without apprehension. I enjoy explaining urological conditions and creating treatment plans with my patients to help manage and improve their quality of life”

In Melissa’s spare time, she enjoys long hikes, exploring different museums and parks, and entertaining her 9 nieces and nephews.