GM
33 Years of Experience
Accepting patients
Affiliated with a Castle Connolly Top Hospital
Who is Dr. Maassen, Internist in Saint Louis, MO?
Dr. Gary Maassen, MD is an Internist, who primarily practices in Saint Louis, MO. He has been practicing for over 33 years and is board certified by the American Board of Internal Medicine. Dr. Maassen graduated from Saint Louis University School of Medicine and completed his residency at St Johns Mercy Med Ctr, Internal Medicine. Dr. Maassen is fluent in English, and is currently seeing new patients. Dr. Maassen’s practice accepts Medicare and other major insurance plans. To book an appointment or to confirm insurance options, please call Dr. Maassen’s office at (314) 843-7333.
Where did Dr. Maassen go to medical school and complete their residency?
Residency: St Johns Mercy Med Ctr, Internal Medicine | Johns Hopkins University/Bayview Medical Center Program
Medical School: St Louis Univ Sch of Med, St Louis Mo | Saint Louis University School of Medicine
Is Dr. Maassen board certified in Internist?
Yes, Dr. Gary Maassen, MD is board certified by the American Board of Internal Medicine
What languages does Dr. Maassen speak?
Dr. Maassen and their clinical team can communicate with patients in the following languages:
English
What conditions does Dr. Maassen treat?
As a Internist, Dr. Maassen 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. Maassen. 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.
Also known as:
- High Blood Pressure
- Hypertension
- Primary Hypertension
- Essential Hypertension
ICD-10 Codes:
- I10: Essential (primary) hypertension
Also known as:
- Chronic Kidney Disease from High Blood Pressure
- Chronic Kidney Disease, Stage 3a
- Chronic Kidney Disease
- High Blood Pressure
- Chronic Kidney Disease (CKD)
- Hypertensive Chronic Kidney Disease
- High Blood Pressure Kidney Disease
- Hypertension-Related Kidney Disease
- CKD Stage 3a
- Moderate Chronic Kidney Disease
ICD-10 Codes:
- I129: Hypertensive chronic kidney disease with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease
- N1831: Chronic kidney disease, stage 3a
Also known as:
- Type 2 Diabetes
- Type 2 Diabetes with Diabetic Neuropathy
- Type 2 Diabetes with Peripheral Artery Disease
- Diabetes Type 2
- Type 2 diabetes
- Diabetic Nerve Problems
- Diabetic Neuropathy
- Diabetes Complicationss
- Diabetes Mellitus Type 2
- Adult-Onset Diabetes
- Non-Insulin Dependent Diabetes
- Diabetic Nerve Damage
- Diabetic Polyneuropathy
- Peripheral Neuropathy from Diabetes
- Diabetes Mellitus Nerve Problems
- Diabetic Blood Vessel Disease
- PAD from Diabetes
- Circulation Problems from Diabetes
ICD-10 Codes:
- E119: Type 2 diabetes mellitus without complications
- E1142: Type 2 diabetes mellitus with diabetic polyneuropathy
- E1151: Type 2 diabetes mellitus with diabetic peripheral angiopathy without gangrene
Also known as:
- Mixed High Cholesterol and Triglycerides
- Cholesterol
- Triglycerides
- Mixed hyperlipidemia
- Combined hyperlipidemia
- High lipids
ICD-10 Codes:
- E782: Mixed hyperlipidemia
Also known as:
- Immunization Visit
- Vaccines
- Vaccination appointment
- Shot visit
- Immunization encounter
ICD-10 Codes:
- Z23: Encounter for immunization
Also known as:
- Long-Term Blood Thinner Use
- Blood Thinners
- Chronic anticoagulant therapy
- Ongoing blood thinner treatment
- Anticoagulant medication use
ICD-10 Codes:
- Z7901: Long term (current) use of anticoagulants
Also known as:
- High Blood Pressure Heart and Kidney Disease with Heart Failure
- Chronic Kidney Disease
- Heart Failure
- High Blood Pressure
- Hypertensive Cardiorenal Syndrome
- Heart and Kidney Failure from High Blood Pressure
ICD-10 Codes:
- I130: Hypertensive heart and chronic kidney disease with heart failure and stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease
Also known as:
- Routine Blood Pressure Check (Normal Findings)
- Vital Signs
- Normal BP reading
- Blood pressure screening, all clear
- Healthy blood pressure check
ICD-10 Codes:
- Z0130: Encounter for examination of blood pressure without abnormal findings
Also known as:
- Routine Adult Health Checkup
- Health Checkup
- Adult physical exam
- Annual wellness visit for adults
- General adult medical exam
ICD-10 Codes:
- Z0000: Encounter for general adult medical examination without abnormal findings
Also known as:
- Therapeutic Drug Monitoring
- Drug level testing
- Medication monitoring
- Therapeutic drug management
ICD-10 Codes:
- Z5181: Encounter for therapeutic drug level monitoring
Also known as:
- Elevated Blood Pressure
- High Blood Pressure
- High Blood Pressure Reading
- Prehypertension
- Borderline High Blood Pressure
ICD-10 Codes:
- R030: Elevated blood-pressure reading, without diagnosis of hypertension
Also known as:
- High Cholesterol
- Cholesterol
- Triglycerides
- Hyperlipidemia
- High lipids
- Dyslipidemia
ICD-10 Codes:
- E785: Hyperlipidemia, unspecified
Also known as:
- Anemia
- Low Red Blood Cell Count
- Low Hemoglobin
- Iron deficiency
ICD-10 Codes:
- D649: Anemia, unspecified
Also known as:
- Hypothyroidism
- Congenital hypothyroidism
- Hypothyroidism (Underactive Thyroid)
- Underactive Thyroid
- Low Thyroid Function
ICD-10 Codes:
- E039: Hypothyroidism, unspecified
Also known as:
- Low Sodium Levels
- Fluid and Electrolyte Balance
- Sodium
- Hyponatremia
- Low Blood Sodium
- Sodium Deficiency
ICD-10 Codes:
- E871: Hypo-osmolality and hyponatremia
Also known as:
- Mammogram for Breast Cancer Screening
- Health Screening
- Mammography
- Breast Cancer Screening (PDQ®)
- Mammograms
- Breast X-ray
- Breast Cancer Check
ICD-10 Codes:
- Z1231: Encounter for screening mammogram for malignant neoplasm of breast
Also known as:
- COPD
- Chronic Obstructive Pulmonary Disease
- Chronic Lung Disease
- Emphysema and Chronic Bronchitis
ICD-10 Codes:
- J449: Chronic obstructive pulmonary disease, unspecified
Which procedures does Dr. Maassen perform as a Internist?
As a Internist, procedures performed by an Dr. Gary Maassen 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
For detailed information, please contact Dr. Maassen's office.
Does Dr. Maassen accept my insurance?
Dr. Maassen accepts most major insurance plans. Important: Please call our office at (314) 843-7333 before your appointment to verify that your specific plan and network are accepted.
What insurance plans does Dr. Maassen accept in Saint Louis, MO?
Dr. Maassen in Saint Louis, MO accepts plans from many carriers. While this list is updated regularly, it is not a guarantee of coverage.
Top Insurances
Medicare
State of Tennessee
View All Insurances
Where is Dr. Maassen's office located?
What is Dr. Maassen's NPI number?An National Provider Identifier (NPI) is a unique ID number that identifies doctors and healthcare providers nationwide.
Dr. Maassen's National Provider Identifier (NPI) number is 1831170968.
What common questions do patients ask about Dr. Maassen?
Here are answers to patients Frequently Asked Questions (FAQ’s) about Dr. Maassen
What is Dr. Gary Maassen's specialty?
Dr. Maassen is a Internist near Saint Louis, MO.
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.
Contact Dr. Maassen to book an appointment today.Is this Dr. Gary Maassen affiliated with a ranked Castle Connolly Top Hospital?
Yes, Dr. Maassen is affiliated with Missouri Baptist Medical Center which is a Castle Connolly Top Hospital. Castle Connolly Top Hospitals are healthcare institutions recognized for their excellence in specific medical procedures and overall patient care. They are identified through a rigorous peer nomination process, evaluating factors like patient outcomes, quality of care, and expertise. The list recognizes hospitals that excel in 20 or more specific medical procedures, representing the top 25% nationwide. Castle Connolly Top Hospitals
Where can I learn more about Internist?
Explore Internist with insights from trusted medical experts on EverydayHealth.com, where you'll find the most relevant content and helpful condition guides for up-to date information about symptoms, causes, diagnosis, treatment and more. See all our health guides to find trusted information on medical conditions from our experts at Everyday Health.
Is Gary Maassen accepting new patients in Saint Louis, MO?
Yes, Dr. Gary Maassen is accepting new patients at this time.
Does Dr. Gary Maassen offer online booking?
Please contact Dr. Maassen's office at (314) 843-7333 for information about online booking, telehealth, or to schedule an appointment.
How can I make an appointment with Gary Maassen?
Please contact Dr. Maassen's office at (314) 843-7333 for information regarding telehealth appointment availability or for scheduling assistance.
Which board certifications does Dr. Gary Maassen have?
Dr. Gary Maassen is certified by the American Board of Internal Medicine.
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