Affiliated with a Castle Connolly Top Hospital
Who is Dr. Ma, Internist in Ontario, CA?
Is Dr. Ma board certified as an Internist?
Yes, Dr. Michael Ma, MD is board certified by the American Board of Internal Medicine
What languages does Dr. Ma speak?
Dr. Ma and their clinical team can communicate with patients in the following languages:
- English
What conditions does an Internist like Dr. Ma typically treat?
As an Internist, Dr. Ma diagnoses, treats, and manages a wide range of conditions. This condition information is derived from anonymized insurance claims and highlights the medical conditions most commonly treated by Dr. Ma. It provides insight into the doctor’s areas of experience and expertise based on real-world patient encounters from the past two years, updated quarterly. Learn more about our claims-based healthcare methodology.
Also known as:
- Other Specific Healthcare Encounters
- Special Medical Visits
- Unusual Doctor Appointments
- Healthcare for Unique Situations
ICD-10 Codes:
- Z7689: Persons encountering health services in other specified circumstances
Also known as:
- High Blood Pressure
- Hypertension
- Primary Hypertension
- Essential Hypertension
ICD-10 Codes:
- I10: Essential (primary) hypertension
Also known as:
- Heart Failure
- Congestive Heart Failure
- CHF
- Cardiac Insufficiency
ICD-10 Codes:
- I509: Heart failure, unspecified
Also known as:
- Immunization Visit
- Vaccines
- Vaccination appointment
- Shot visit
- Immunization encounter
ICD-10 Codes:
- Z23: Encounter for immunization
Also known as:
- Endometrial Cancer
- Uterine Cancer
- Endometrial Cancer Treatment (PDQ®)
- Malignant Endometrial Tumor
- Endometrial Carcinoma
- Cancer of the Endometrium
ICD-10 Codes:
- C541: Malignant neoplasm of endometrium
Also known as:
- Prostate Cancer
- Prostate Cancer Treatment (PDQ®)
- Prostatic Carcinoma
- Prostate Gland Cancer
- Malignant Prostate Tumor
ICD-10 Codes:
- C61: Malignant neoplasm of prostate
Also known as:
- Breast Cancer
- Mammary cancer
- Breast carcinoma
- Breast tumor
ICD-10 Codes:
- C50911: Malignant neoplasm of unspecified site of right female breast
Also known as:
- Colorectal Cancer
- Rectal cancer
- Colon cancer
- Bowel cancer
- Malignant neoplasm of rectum
ICD-10 Codes:
- C20: Malignant neoplasm of rectum
What procedures does an Internist like Dr. Ma typically perform?
As an Internist, procedures performed by Dr. Michael Ma may include:
- Ambulatory Care Consultation
- Annual Check Up
- Annual Physical
- Aromatherapy
- Bladder and Bowel Management
- Blood Pressure Testing
- Bowel and Bladder Management
- Certified Medical Examination for Commercial Driver / Vessel Master
Please contact Dr. Ma's office directly to confirm care for your specific procedure, for more information, or to schedule a consultation.
Does Dr. Ma accept my insurance?
Dr. Ma accepts most major insurance plans. Important: Please call our office at (909) 724-5000 before your appointment to verify that your specific plan and network are accepted.
What insurance plans does Dr. Ma accept in Ontario, CA?
Dr. Ma in Ontario, CA accepts plans from many carriers. While this list is updated regularly, it is not a guarantee of coverage.
Top Insurances
Kaiser Permanente
Medicare
View All Insurances
Where is Dr. Ma's office located?
What hospitals are Dr. Ma affiliated with?
Castle Connolly Top Hospital
This doctor is affiliated with a Castle Connolly Top Hospital.
Dr. Ma has admitting privileges at the following hospitals:

Ranked Cancer Surgery
Ranked Mastectomy
What is Dr. Ma's NPI number?A National Provider Identifier (NPI) is a unique ID number that identifies doctors and healthcare providers nationwide.
Dr. Ma's National Provider Identifier (NPI) number is 1891945804.
What common questions do patients ask about Dr. Ma?
Here are answers to patients Frequently Asked Questions (FAQ’s) about Dr. Ma
What is Dr. Michael Ma's specialty?
What does an Internist do?
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.