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Monday to Friday, between the hours of 8:30 a.m. - Noon & 1:00 - 5 p.m.

Dr. Christine Harter

Christine Harter, MD, Primary Care Physician Specializing in Internal Medicine and Headache Treatment A 1985 graduate of Johns Hopkins School of Medicine, Dr. Harter practiced internal medicine for 15 years before moving to the Valley in 2000. read more

Dr. Collins Villamor

Dr. Usma Ahmad, Primary Care Physician Specializing in Internal Medicine and Allergy Treatment Grew up in Glendale, AZ. Bachelors in Spanish and Physics/Chemistry from Univ. of Arizona. Medical residency in New Jersey and hospice fellowship at VA/Mt. Sinai in NY. Joined Pinnacle 9/14.
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Primary Care

Excellence + Compassion = Our model for complete health care. Our primary concern is you, the patient. We take pride in providing personal and friendly primary care in a caring environment.

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Women's Care

We are committed to providing high-quality, comprehensive primary and specialty health care to women. Dr. Harter and Dr. Villamor understand the unique health care needs that women face not only in their day-to-day wellness, but in their long-term health care as well.

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Internal Medicine

Internists are physicians who specialize in the prevention, detection, and treatment of illnesses in adults. Our physicians have 30 years of combined experience in internal medicine treating such illnesses as diabetes, heart and lung disease, chronic headaches, and more.

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Headache Treatment

Dr. Harter has long had an interest in headache treatment, since she herself and a number of friends and relatives suffer from migraines. She became one of only two physicians in Arizona to pass the first national board exam in headache medicine, in 2006.

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Allergy Care

Dr. Villamor and Dr. Harter offer allergy care with treatment involving a form of immunotherapy known as Sublingual Immunotherapy. This treatment is administered by placing a sublingual drop under the tongue, which can be done in the comfort of your home and is monitored every 12 weeks by your physician.

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