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 Pain
- Digestive System Symptoms
- Gallstones
- Gastritis
- Hemorrhoids
Conditions and procedures
Conditions I treat
- Abdominal Pain
- Abnormal Stool
- Achalasia
- Acute Pancreatitis
- Alimentary Tract Foreign Body
- Anus And Rectum Diseases
- Aphagia And Dysphagia
- Barrett's Esophagus
- Benign Neoplasm Of Colon, Rectum, Anus And Anal Canal
- Benign Neoplasm Of Digestive System
- Bile Duct Stones
- Blood In Stool
- Bowel Obstruction
- Chronic Constipation
- Chronic Diarrhea
- Colitis
- Colon Cancer
- Colon Polyps
- Congenital Malformations Of Digestive System
- Crohn's Disease
- Crohn's Disease [Regional Enteritis]
- Diaphragmatic Hernia
- Digestive System Complications
- Digestive System Diseases
- Digestive System Symptoms
- Diseases Of Esophagus
- Diseases Of Stomach And Duodenum
- Diverticulitis
- Duodenal Ulcer
- Duodenitis
- Dysphagia
- Epigastric Pain
- Esophageal Cancer
- Esophageal Stricture
- Esophagitis
- Flatulence
- Functional Dyspepsia
- Functional Intestinal Disorders
- Gallbladder Disease
- Gallstones
- Gastric Cancer
- Gastritis
- Gastrointestinal Bleeding
- Helicobacter Pylori
- Hemorrhoids
- Hepatitis C
- Hepatomegaly
- Hepatomegaly And Splenomegaly
- Jaundice
- Liver Cirrhosis
- Liver Failure
- Liver Fibrosis
- Malabsorption
- Melena
- Nausea
- Noninfective Gastroenteritis
- Pancreatitis
- Paralytic Ileus And Intestinal Obstruction
- Peptic Ulcer Disease
- Perianal Fistula
- Portal Hypertension
- Postprandial Diarrhea
- Primary Sclerosing Cholangitis
- Proctitis
- Rectal Cancer
- Rectal Pain
- Regional Enteritis
- Small Intestine Cancer
- Stomach Cancer
- Stomach Cramps
- Stomach Ulcers
- Ulcerative Colitis
- Viral Hepatitis
- Vomiting
Procedures I perform
- Capsule Endoscopy
- Celiac Disease Treatment
- Colonoscopy Through Stoma
- Colonoscopy With Biopsy
- Diarrhea Treatment
- Dilation Of Esophagus
- Endoscopic Mucosal Resection
- Endoscopic Retrograde Cholangiopancreatography
- Endoscopic Retrograde Cholangiopancreatography (ERCP)
- Endoscopic Submucosal Dissection
- Enteroscopy
- Esophageal Dilation
- Esophageal PH Monitoring
- Esophagogastroduodenoscopy With Biopsy
- Fecal Microbiota Transplant
- Fecal Transplant
- Flexible Colonoscopy With Biopsy
- Gastrointestinal Biopsy
- Gastrointestinal Foreign Body Removal
- Gastrointestinal Motility Study
- Gastrostomy
- Hydrogen Breath Test
- Intestinal Biopsy
- Irritable Bowel Syndrome Treatment
- Lactose Breath Test
- Lactose Intolerance Testing
- Lower Gi Endoscopy
- Pancreatitis Treatment
- PH Monitoring
- Rectal Biopsy
- Retrograde Cholangiopancreatography
- Sigmoidoscopy With Biopsy
- Stomach Pain Treatment
- Swallowing Disorder Treatment
- Upper Endoscopy
- Upper Gi Endoscopy
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
- IH-Network Only Plus
- DC/MD SHOP QHP Small Business Plans
- CareFirst MedStar Select PPO
- United Healthcare Choice Plus Cardiac Global
- Aetna HMO-Open Access/Select OA/HealthFund/Health Network Option OA
- CIGNA HMO Open Access
- Kaiser Permanente Flexible Choice 3-tier POS
- CareFirst Federal Employee Program (Std. & Basic PPO)
- Core Essential (HMO)
- Optima Family Care MCO - VA Medicaid MCO
- AmeriHealth Caritas DC Healthy Families
- CareFirst Blue Choice Opt Out Open Access
- Network OA
- Coventry Health Care National Network PPO
- Police and Fire Clinic
- MedStar Family Choice DC Healthcare Alliance
- Aetna Medicare Advantage PFFS Plan
- Choice Care Network/HUMANA (PPO)
- CareFirst Dual Prime HMO-SNP
- UnitedHealthcare Medicare Advantage DSNP District of Columbia
- IH-Open Network Only Plus
- Aetna Signature Administrator PPO/TPA
- Aetna Premier 200PD
- NYC Medicare Advantage Plus
- Options PPO Cardiac Global
- Kaiser Maryland Medicaid MCO
- Select HMO/HealthFund/Health Network
- CIGNA EPO
- Alterwood Advanatge HMO & DSNP Plans
- POS OA
- Maryland Physicians Care MCO
- TRICARE East Select
- Medicare Advantage - Advantra Value (PPO)
- Sentara Health
- United Healthcare Community Plan - VA Medicaid MCO
- Choice POS II
- Choice POS
- United Healthcare Options (PPO)
- Aetna Traditional Choice (PPO)
- Aetna Advantage 6350PD
- Johns Hopkins Advantage MD HMO
- Kaiser Permanente Medicare Advantage Signature and Select
- Coventry Health Care of Virginia
- Amerigroup DC Healthy Families
- WellPoint Maryland - Maryland Health Choice
- OA Plus
- Mamsi Life & Health (Indem./PPO)
- Medicare FFS
- HealthyBlue PPO
- IH-Indemnity
- Amerigroup DC Alliance
- Healthy Blue (HMO, POS)
- Cigna True Choice Plus Medicare (PPO)
- Veterans Affairs Community Care Network
- IH-EPO Plus
- MD IPA (HMO) & MD IPA Preferred Cardiac Global
- TRICARE East Prime
- Aetna Open Choice (PPO)
- AmeriHealth Caritas DC Healthcare Alliance
- Anthem BCBS of VA HealthKeepers (HMO)
- HighMark
- CareFirst MedStar PPO
- Aetna Classic 3500
- CareFirst EPO
- IH-Open HMO Option
- Aetna Advantage 6350
- Anthem BCBS Medi Blue SNP
- CIGNA HMO & Network (HMO)
- Cigna Achieve Medicare (HMO C-SNP)
- Anthem BCBS Medi Blue Dual Adv
- Johns Hopkins Advantage MD PPO
- United Student Resources
- CareFirst Administrators
- Kaiser Permanente Medicare Plus
- Kaiser Permanente Signature - Added Choice
- Anthem Federal Employee Program Standard
- Navigate
- Mamsi Life & Health (Indem./PPO) Cardiac Global
- Aetna Managed Choice (POS)
- CareFirst Group Medicare Advantage prescription drug benefit (PPO)
- HumanaChoice Honor's plan PPO
- Beech Street PPO
- CIGNA SureFit (HMO)
- Kaiser Permaenete Signature - Added Choice Cardiac Global
- UnitedHealthcare Medicare Adv. Special Needs Plans
- Tricare Reserve Select
- United Healthcare Choice Cardiac Global
- United Healthcare Select HMO - EPO/NPP
- Employee Health Plan
- TriWest Healthcare Alliance
- Aetna Managed Choice Open Access (POS)
- Health Services for Children with Special Needs
- IH-Open EPO Plus
- CIGNA Connect EPO
- MedStar Family Choice - Maryland Health Choice
- Private Fee-for-Service Plans (PFFS)
- CareFirst Maryland Point of Service Plan
- Optimum Choice & Optimum Choice Preferred (POS) Cardiac Global
- Choice POS II Open Access
- Jai Medical Systems - Maryland Health Choice
- Anthem BCBS of VA HealthKeepers (POS & POS OA)
- Cigna Preferred Medicare (HMO)
- Aetna Medicare Advantage HMO & PPO Plans
- Aetna Advantage 5750
- Cigna TotalCare (HMO D-SNP)
- MultiPlan, Inc
- United HealthCare Community Plan - Maryland Health Choice Program
- Coventry of Delaware HMO/PPO
- First Health PPO
- IH-Open POS Plus
- United Healthcare Choice Plus
- Optimum Choice
- United Healthcare Navigate Cardiac Global
- CareFirst (NCA) Indemnity
- Kaiser Permanente Signature
- UHC Passport
- Aetna Basic
- IH-PPO
- Blue Choice Advantage
- Private Health Care Systems (PPO)
- MedStar Family Choice DC Healthy Families
- Anthem BCBS of VA HealthKeepers Plus
- CIGNA POS/Network POS
- Aetna Elect Choice/ EPO (Aetna Health Fund)
- Anthem BCBS of VA Key Care POS/PPO/Indemnity
- CIGNA PPO
- Aetna Worker's Compensation Network
- IH-Open HMO
- Kaiser Permanente Select Cardiac Global
- Aetna Classic 5000
- CareFirst FEP Blue Focus
- United Medicare Private Fee-for-Service (PFFS) plans
- Medicare Direct
- Fee-for-Service (FFS) District of Columbia, Maryland and Virginia Medicaid
- CareFirst Blue Card Program
- United Healthcare Choice
- United Healthcare Select HMO-EPO/NPP Cardiac Global
- Aetna Classic 5000PD
- Aetna Quality Point of Service (POS)
- Aetna Student Health Insurance
- TRICARE for Life East
- IH-POS Plus
- Great-West Healthcare POS/CIGNA
- Cigna True Choice Medicare (PPO)
- IH-POS
- Erickson Advantage Plans
- Advantra Platinum (PPO)
- CareFirst BlueCross BlueShield Advantage Core/Enhanced
- Magellan Complete Care of VA - VA Medicaid MCO
- UnitedHealthcare and AARP Medicare Complete Plans
- UHC Group Medicare Advantage Plans (HMO, POS, PPO)
- CareFirst BlueChoice HMO
- Aetna HMO
- BlueChoice Open Access
- CIGNA PPO Plus
- Humana Medicare Advantage - PPO
- Kaiser Permanente Flexible Choice POS Cardiac Global
- Priority Partners - Maryland Health Choice
- AMERIVANTAGE/Amerigroup Community Care
- CareFirst Community Health Plan of MD
- Kaiser Permanente HMO Plus and DHMO Plus Member
- CIGNA Indemnity
- IH-Open POS II
- IH-HMO
- Kaiser Permanente Select
- Uniformed Services Family Health Plan
- Optimum Choice Preferred (POS)
- CareFirst Blue Choice Opt Out Plus Open Access (POS)
- Choice Fund PPO
- BCBS Out-of-State Medicare Plans (Blue Advantage)
- Anthem BCBS Medi Blue Plus
- CareFirst Group Medicare Advantage
- Humana Medicare Advantage - HMO Open Access
- First Health PPO
- Geisinger Medicare Advantage
- Aetna Elect Choice/ Open Access (POS)
- Kaiser Permanente Select - Added Choice
- OCI Direct (HMO)
- M.D. IPA Preferred (POS)
- Aetna Better Health of MD
- CareFirst Maryland Indemnity or PPO
- Cigna Alliance Medicare (HMO)
- CareFirst Blue Preferred PPO
- M.D. IPA (HMO)
- Aetna Better Health of VA
- HumanaChoice PPO
- BCBS of Michigan (BCN Advantage,Security Blue, Freedom, Medicare PLUS Blue Group PPO)
- Aetna VA Exchange
- Anthem Federal Employee Program Basic
- Humana Gold Plus HMO
- UnitedHealthcare Individual Exchange Plans
- HUMANA/Choice Care Medicare Plans (Choice, Gold Choice)
- Lasso Healthcare - Medicare Medical Savings Account
- United Healthcare Select Plus (POS)
- Johns Hopkins Advantage MD PLUS PPO
- CareFirst NASCO
Education
Board Certification: American Association of Nurse Practitioners, American Academy 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)