William Hemsley Merwin, MD| Critical Care Medicine, Sleep Medicine | MedStar Health
William Hemsley Merwin, MD
Provider is directly employed by MedStar Health
Provider is directly employed by MedStar Health
Specialties: Critical Care Medicine, Sleep Medicine, Pulmonary Medicine
Languages: English
Only sees patients in a hospital setting and does not schedule visits.
About me
As a Board Certified/Board eligible critical care physician, all conditions requiring intensive care in the medical, surgical, or neurosciences ICU are treated.
Conditions and procedures
Procedures I perform
- Advanced Sleep Phase Syndrome Treatment
- Bronchoscopy
- Delayed Sleep Phase Syndrome Treatment
- Home Sleep Apnea Test
- Hypoglossal Nerve Stimulation
- Idiopathic Hypersomnia Treatment
- Polysomnography
- Shift Work Sleep Disorder Treatment
Practice locations
Distance from Change Location Enter your Location
5601 Loch Raven Blvd
Russell Morgan Bldg Ste 500
Baltimore, MD, 21239
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
- Employee Health Plan
- Kaiser Maryland Medicaid MCO
- Medicare Advantage - Advantra Value (PPO)
- Optimum Choice
- TRICARE East Select
- Private Fee-for-Service Plans (PFFS)
- Kaiser Permanente Flexible Choice POS Cardiac Global
- HUMANA/Choice Care Medicare Plans (Choice, Gold Choice)
- Humana Gold Plus HMO
- Optimum Choice Preferred (POS)
- United Medicare Private Fee-for-Service (PFFS) plans
- Coventry Health Care of Virginia
- IH-Open POS Plus
- Anthem BCBS of VA HealthKeepers Plus
- Alterwood Advanatge HMO & DSNP Plans
- Anthem BCBS of VA HealthKeepers (HMO)
- BCBS Out-of-State Medicare Plans (Blue Advantage)
- Aetna Classic 5000PD
- Choice POS
- Kaiser Permanente Medicare Plus
- Kaiser Permanente Select Cardiac Global
- Private Health Care Systems (PPO)
- First Health PPO
- Choice Fund PPO
- Anthem BCBS of VA HealthKeepers (POS & POS OA)
- MD IPA (HMO) & MD IPA Preferred Cardiac Global
- Aetna Premier 200PD
- HealthyBlue PPO
- CareFirst MedStar Select PPO
- IH-PPO
- Maryland Physicians Care MCO
- UHC Group Medicare Advantage Plans (HMO, POS, PPO)
- Aetna Basic
- MedStar Family Choice DC Healthy Families
- CareFirst BlueChoice HMO
- CareFirst NASCO
- CareFirst Group Medicare Advantage
- Priority Partners - Maryland Health Choice
- IH-POS Plus
- United Student Resources
- IH-Open Network Only Plus
- Aetna Better Health of VA
- Select HMO/HealthFund/Health Network
- CareFirst Blue Preferred PPO
- Choice POS II Open Access
- Anthem BCBS Medi Blue SNP
- CareFirst Administrators
- Tricare Reserve Select
- United Healthcare Select Plus (POS)
- Anthem BCBS of VA Key Care POS/PPO/Indemnity
- IH-Network Only Plus
- IH-Open EPO Plus
- CareFirst BlueCross BlueShield Advantage Core/Enhanced
- Mamsi Life & Health (Indem./PPO) Cardiac Global
- IH-Open HMO Option
- Optimum Choice & Optimum Choice Preferred (POS) Cardiac Global
- Medicare FFS
- CareFirst Maryland Indemnity or PPO
- Health Services for Children with Special Needs
- Aetna Medicare Advantage PFFS Plan
- TriWest Healthcare Alliance
- IH-Indemnity
- M.D. IPA Preferred (POS)
- Aetna Quality Point of Service (POS)
- Amerigroup DC Healthy Families
- Amerigroup DC Alliance
- CareFirst Group Medicare Advantage prescription drug benefit (PPO)
- Aetna Advantage 6350
- BlueChoice Open Access
- CareFirst EPO
- AmeriHealth Caritas DC Healthcare Alliance
- Johns Hopkins Advantage MD HMO
- WellPoint Maryland - Maryland Health Choice
- United HealthCare Community Plan - Maryland Health Choice Program
- Johns Hopkins Advantage MD PPO
- Aetna Open Choice (PPO)
- AmeriHealth Caritas DC Healthy Families
- Core Essential (HMO)
- Cigna Alliance Medicare (HMO)
- Great-West Healthcare POS/CIGNA
- HumanaChoice Honor's plan PPO
- Erickson Advantage Plans
- Coventry Health Care National Network PPO
- United Healthcare Community Plan - VA Medicaid MCO
- United Healthcare Choice Plus Cardiac Global
- Fee-for-Service (FFS) District of Columbia, Maryland and Virginia Medicaid
- Aetna HMO-Open Access/Select OA/HealthFund/Health Network Option OA
- CIGNA HMO Open Access
- CIGNA PPO
- Veterans Affairs Community Care Network
- Aetna Elect Choice/ Open Access (POS)
- Johns Hopkins Advantage MD PLUS PPO
- Aetna Elect Choice/ EPO (Aetna Health Fund)
- First Health PPO
- Humana Medicare Advantage - HMO Open Access
- Aetna Traditional Choice (PPO)
- MedStar Family Choice - Maryland Health Choice
- IH-HMO
- BCBS of Michigan (BCN Advantage,Security Blue, Freedom, Medicare PLUS Blue Group PPO)
- Anthem Federal Employee Program Standard
- CIGNA POS/Network POS
- Cigna Preferred Medicare (HMO)
- Beech Street PPO
- CareFirst Dual Prime HMO-SNP
- OCI Direct (HMO)
- IH-POS
- Aetna Better Health of MD
- Kaiser Permanente Select
- Aetna Advantage 5750
- Network OA
- United Healthcare Navigate Cardiac Global
- Cigna True Choice Plus Medicare (PPO)
- Choice POS II
- Healthy Blue (HMO, POS)
- Lasso Healthcare - Medicare Medical Savings Account
- CareFirst Blue Choice Opt Out Plus Open Access (POS)
- MultiPlan, Inc
- UnitedHealthcare and AARP Medicare Complete Plans
- OA Plus
- Navigate
- Choice Care Network/HUMANA (PPO)
- Aetna HMO
- Geisinger Medicare Advantage
- NYC Medicare Advantage Plus
- CareFirst Federal Employee Program (Std. & Basic PPO)
- CIGNA PPO Plus
- Kaiser Permanente HMO Plus and DHMO Plus Member
- Kaiser Permaenete Signature - Added Choice Cardiac Global
- Aetna Classic 5000
- Kaiser Permanente Medicare Advantage Signature and Select
- Aetna Worker's Compensation Network
- CareFirst (NCA) Indemnity
- CIGNA EPO
- TRICARE East Prime
- Kaiser Permanente Signature - Added Choice
- Police and Fire Clinic
- UnitedHealthcare Medicare Advantage DSNP District of Columbia
- Anthem BCBS Medi Blue Plus
- Blue Choice Advantage
- CIGNA HMO & Network (HMO)
- Coventry of Delaware HMO/PPO
- United Healthcare Choice Plus
- CIGNA Connect EPO
- MedStar Family Choice DC Healthcare Alliance
- UHC Passport
- AMERIVANTAGE/Amerigroup Community Care
- IH-Open HMO
- UnitedHealthcare Individual Exchange Plans
- Aetna Signature Administrator PPO/TPA
- Cigna Achieve Medicare (HMO C-SNP)
- CareFirst FEP Blue Focus
- Jai Medical Systems - Maryland Health Choice
- HighMark
- Kaiser Permanente Select - Added Choice
- Anthem BCBS Medi Blue Dual Adv
- Cigna True Choice Medicare (PPO)
- IH-EPO Plus
- Aetna Managed Choice (POS)
- United Healthcare Select HMO-EPO/NPP Cardiac Global
- Options PPO Cardiac Global
- Aetna VA Exchange
- Anthem Federal Employee Program Basic
- POS OA
- Kaiser Permanente Flexible Choice 3-tier POS
- M.D. IPA (HMO)
- IH-Open POS II
- TRICARE for Life East
- Humana Medicare Advantage - PPO
- Aetna Classic 3500
- Aetna Managed Choice Open Access (POS)
- Mamsi Life & Health (Indem./PPO)
- DC/MD SHOP QHP Small Business Plans
- Aetna Medicare Advantage HMO & PPO Plans
- UnitedHealthcare Medicare Adv. Special Needs Plans
- Optima Family Care MCO - VA Medicaid MCO
- United Healthcare Select HMO - EPO/NPP
- CareFirst Blue Choice Opt Out Open Access
- Magellan Complete Care of VA - VA Medicaid MCO
- Uniformed Services Family Health Plan
- Sentara Health
- CareFirst Blue Card Program
- United Healthcare Choice
- United Healthcare Choice Cardiac Global
- CareFirst MedStar PPO
- Cigna TotalCare (HMO D-SNP)
- HumanaChoice PPO
- CareFirst Community Health Plan of MD
- Medicare Direct
- Advantra Platinum (PPO)
- Aetna Student Health Insurance
- CIGNA Indemnity
- Kaiser Permanente Signature
- CIGNA SureFit (HMO)
- Aetna Advantage 6350PD
- CareFirst Maryland Point of Service Plan
- United Healthcare Options (PPO)
Education
Board Certification: American Board of Internal Medicine, Pulmonary Disease
Board Certification: American Board of Internal Medicine, Internal Medicine
Fellowship: John Hopkins University (2026)
Residency: Georgetown University School of Medicine GME (2021)
Residency: University of Kentucky College of Medicine (2018)
Internship: SUNY Upstate University Hospital (2016)
Medical School: Georgetown University School of Medicine (2015)