About me
Katherine (Katie) Johnson, DNP, FNP-C, is a nationally certified and doctorally prepared nurse practitioner with MedStar Health Gastroenterology at St. Mary’s Hospital. She specializes in gastroenterology and works in collaboration with MedStar Health’s board-certified gastroenterology physicians.
Dr. Johnson is skilled in diagnosing and treating a wide variety of gastroenterology conditions, including gastroesophageal reflux disease, H. pylori, small intestinal bacterial overgrowth, esophagitis, peptic ulcer disease, gastritis, irritable bowel disorders, pancreaticobiliary disorders, colitis, ulcerative colitis, and Crohn’s disease. She is also deeply passionate about preventative screenings and often conducts pre-procedure visits for colorectal cancer screenings. Her comprehensive approach to care includes lifestyle modifications such as diet and exercise, medication management, and other therapeutic interventions.
Dr. Johnson was born and raised in St. Mary’s County. She attended Towson University to obtain a Bachelor of Science in Nursing. After her undergraduate studies she worked as a registered nurse at The Johns Hopkins Hospital for nine years specializing in medical surgical oncology (gastroenterology and otolaryngology malignancies) and radiation oncology. She then attended Johns Hopkins University to obtain a Doctor of Nursing Practice and worked in family medicine as a primary care nurse practitioner in Annapolis, MD, while completing a primary care fellowship through Johns Hopkins University School of Nursing. She is happy to be back in St. Mary’s County serving the community that raised her.
“My philosophy of care is patient centered. I believe everyone deserves to feel comfortable, listened to, and respected while receiving health care. I want my patients to feel empowered to ask questions and be understood and well informed. I am passionate about patient education and am honored to work with my patients to help them feel their best and reach their goals.”
Clinical areas of focus
- Abdominal Distention
- Abnormal Bowel Movement
- Abnormal Stool
- Anal Fissure
- Bleeding Hemorrhoids
- Chronic Diarrhea
- Constipation
- Diarrhea
- Gastrointestinal Bleeding
- Helicobacter Pylori
- Postprandial Diarrhea
- Rectal Pain
- Stomach Pain
Conditions and procedures
Conditions I treat
- Abdominal Bloating
- Abdominal Distention
- Abdominal Pain
- Abnormal Amylase Blood Test
- Abnormal Bowel Movement
- Abnormal Liver Function Blood Test
- Abnormal Stool
- Achalasia
- Acute Pancreatitis
- Alcoholic Liver Disease
- Allergic Esophagitis
- Altered Bowel Habits
- Anal Cancer
- Anal Fissure
- Anal Fistula
- Anal Itching
- Anal Pain
- Anal Spasm
- Anemia
- Annular Pancreas
- Anorexia
- Atrophic Gastritis Without Mention Of Hemorrhage
- Autoimmune Enteropathy
- Barrett's Esophagus
- Benign Neoplasm Of Colon
- Biliary Tract Disease
- Bleeding Hemorrhoids
- Blood In Stool
- Bowel Dysmotility
- Bright Red Blood Per Rectum
- Celiac Disease
- Choking Sensation
- Cholangitis
- Cholecystitis
- Cholelithiasis
- Cholestasis
- Chronic Abdominal Pain
- Chronic Diarrhea
- Chronic Pancreatitis
- Cirrhosis
- Clostridium Difficile
- Colitis
- Collagenous Colitis
- Colonic Polyps
- Colorectal Malignancy
- Constipation
- Crohn's Disease
- Cyclic Vomiting Syndrome
- Diarrhea
- Digestive Disorders
- Diverticular Disease
- Diverticulitis
- Drug Induced Liver Injury
- Duodenal Ulcer
- Duodenitis
- Dyspepsia
- Dysphagia
- Early Satiety
- Elevated Alkaline Phosphatase Level
- Elevated Ammonia
- Elevated Lipase
- Eosinophilic Colitis
- Eosinophilic Enteritis
- Eosinophilic Esophagitis
- Eosinophilic Gastritis
- Epigastric Pain
- Esophageal Disease
- Esophageal Diverticulum
- Esophageal Mass
- Esophageal Motility Disorders
- Esophageal Spasm
- Esophageal Stricture
- Esophageal Thickening
- Esophageal Ulcer
- Esophageal Varices
- Esophagitis
- Family History Of Colon Cancer
- Family History Of Colon Polyps
- Fatty Liver
- Fecal Impaction
- Fecal Incontinence
- Flatulence
- Focal Nodular Hyperplasia
- Gallbladder Disease
- Gallbladder Polyp
- Gastric Ulcer
- Gastritis
- Gastroenteritis
- Gastroesophageal Reflux Disease
- Gastrointestinal Bleeding
- Gastrojejunal Ulcer
- Gastroparesis
- Giardiasis
- Gluten Sensitivity
- Helicobacter Pylori
- Hematemesis
- Hemochromatosis
- Hemorrhoids
- Hepatomegaly
- Hiatal Hernia
- Ileitis
- Inflammatory Bowel Disease
- Intestinal Obstruction
- Intractable Vomiting
- Iron Deficiency Anemia
- Irritable Bowel Syndrome
- Ischemic Bowel
- Ischemic Colitis
- Jaundice
- Lactose Intolerance
- Left Upper Quadrant Pain
- Liver Disease
- Liver Mass
- Lymphocytic Colitis
- Lynch Syndrome
- Malabsorption
- Malignant Neoplasm Of Stomach
- Melena
- Microscopic Colitis
- Motility Disorders
- Nausea
- Non Alcoholic Fatty Liver Disease
- Non Alcoholic Steatohepatitis
- Obesity
- Obstipation
- Obstructive Jaundice
- Odynophagia
- Ogilvie Syndrome
- Pancreas Divisum
- Pancreatic Cyst
- Pancreatic Insufficiency
- Pancreatic Pseudocyst
- Pancreaticobiliary Disease
- Pancreatitis
- Peptic Ulcer
- Peritonitis
- Pernicious Anemia
- Persistent Vomiting
- Personal History Of Colonic Polyps
- Peutz Jeghers Syndrome
- Polyposis Syndrome
- Polyps
- Portal Hypertension
- Portal Hypertensive Gastropathy
- Positive Hemoccult Fecal Occult Blood Test
- Postprandial Diarrhea
- Primary Biliary Cirrhosis
- Proctitis
- Rectal Bleeding
- Rectal Cancer
- Rectal Pain
- Right Lower Quadrant Pain
- Right Upper Quadrant Pain
- Short Bowel Syndrome
- Small Bowel Disease
- Small Intestine Cancer
- Steatorrhea
- Stomach Cramps
- Stomach Disorders
- Stomach Pain
- Swallowing Problem
- Toxic Liver Injury
- Ulcerative Colitis
- Ulcerative Proctitis
- Vomiting
- Whipple's Disease
- Wilson's Disease
Procedures I perform
- Breath Testing
- Colorectal Screening
Insurance
MedStar Health accepts most major health insurance plans. If you are uncertain as to whether your individual health insurance plan is accepted at MedStar Health, please call your insurance company.
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List of insurance plans we accept
- United Select HMO - EPO/NPP
- Cigna POS Open Access & Open Access Plus
- United Options (PPO) (includes Empire PPO)
- United Mamsi Life & Health
- Tricare East Prime
- Coventry of Delaware HMO/PPO
- United Student Resources
- Private Health Care Systems (PHCS) (PPO)
- United Choice
- Carefirst BlueChoice Opt Out Plus Open Access (POS)
- Innovation Health: POS Plus
- Carefirst BlueChoice Opt Out Open Access
- Cigna POS/Network POS
- Medicaid - District of Columbia
- CareFirst Administrators
- United GEHA (for all other states) Compass Rose
- Coventry Health Care of Virginia
- MedStar Family Choice DC Healthcare Alliance
- Carefirst Healthy Blue (HMO/POS)
- United Erickson Advantage Plans
- Carefirst EPO
- MedStar Family Choice - Maryland Health Choice
- United Navigate
- United Choice Plus
- Carefirst BlueChoice HMO
- Carefirst Blue Preferred PPO
- United MD IPA (HMO)
- Innovation Health: Open POS II
- Kaiser Permanente Signature-Added Choice
- Coventry Health Care National Network PPO
- Carefirst BlueChoice Open Access
- Medicaid - Virginia
- Tricare for Life East
- United Core Essential (HMO)
- MedStar Family Choice DC Healthy Families
- Aetna Managed Choice Open Access (POS)
- Cigna Network Open Access
- Innovation Health: HMO & EPO Plus
- Cigna HMO Open Access
- D-SNP)
- United AARP Medicare Complete
- First Health PPO
- Cigna EPO
- Tricare East Select
- Innovation Health: Indemnity
- CareFirst (NCA) Indemnity
- United MD IPA Preferred (POS)
- Medicaid - Maryland
- Cigna PPO and PPO Plus
- Cigna Indemnity
- Beech Street PPO
- United Golden Rule
- Tricare Reserve Select
- I-SNP
- United Nursing Home Plan (C-SNP
- Maryland Point of Service Plan (MPOS)
- Kaiser Signature
- Aetna HealthFund/Health Network Option OA
- Aetna Choice POS & Choice POS II
- Cigna Choice Fund PPO
- Traditional Medicare Fee for Service
- United Group Medicare Advantage Plans
- United Select Plus (POS)
- Great-West Healthcare POS/CIGNA
- Aetna Select HMO/HealthFund/Health Network
- HumanaChoice Honor’s plan PPO
- HealthyBlue PPO
- Innovation Health: Open POS Plus
- CareFirst Maryland Indemnity or PPO
- Aetna Quality Point of Service (POS)
- Priority Partners - Maryland Health Choice
- Aetna HMO-Open Access/Select OA
- Aetna Student Health Insurance
- Aetna Medicare Advantage HMO & PPO Plans
- CareFirst Group Medicare Advantage prescription drug benefit (PPO)
- United Optimum Choice Preferred (POS) & OCI Direct (HMO)
- Innovation Health: PPO
- Employee Health Plan (EHP)
- Veterans Affairs Community Care Network (VA CCN)
- Innovation Health: Open Network Only Plus
- Aetna Open Choice (PPO)
- Cigna True Choice Plus Medicare (PPO)
- WellPoint Maryland
- Kaiser Select
- CareFirst NASCO
- Kaiser Flexible Choice
- Kaiser Medicare Plus
- Police and Fire Clinic
- Health Services for Children with Special Needs (HSCSN)
- CareFirst Blue Card Program (Out-of-area BCBS plans)
- Aetna Traditional Choice (PPO)
- Cigna Alliance Medicare (HMO) |
- WellPoint Maryland - Maryland Health Choice
- Aetna Signature Administrator PPO/TPA
- Aetna Managed Choice (POS)
- Kaiser HMO Plus and DHMO Plus Member
- United Optimum Choice
- CareFirst MedStar Select PPO
- United Community Plan - Maryland Health Choice Program
- Cigna HMO & Network (HMO)
- Aetna HMO
- Cigna Preferred Medicare
- United Medicare Advantage DSNP District of Columbia
- Aetna Elect Choice/ EPO (Aetna Health Fund)
- CareFirst Group Medicare Advantage
- Federal Employee Program (Std/Basic PPO/Blue Focus)
- CareFirst MedStar PPO
- Kaiser Medicare Advantage Signature and Select
- Cigna TotalCare (HMO D-SNP)
- Cigna Achieve Medicare (HMO C-SNP)
- CareFirst BC/BS Advantage Core/Enhanced
- HumanaChoice PPO
- Kaiser Select-Added Choice
- Uniformed Services Family Health Plan (USFHP)
- Aetna Elect Choice/ Open Access (POS)
- Aetna Open HMO/Open HMO Option/Open EPO Plus
- Virginia Premier
- Innovation Health: Network Only Plus
- UnitedHealthcare Individual Exchange Plans
- Innovation Health: POS
- Veterans Affairs Community Care Network
- Cigna True Choice Medicare (PPO)
Education
Other Certification: American Association of Nurse Practitioners, -
Fellowship: Johns Hopkins University School of Nursing (2024)
Graduate: Johns Hopkins University School of Nursing (2023)
Fellowship: University of Maryland Medical Center Midtown GME (2015)