Walter Klein, MD

  • Gastroenterology
  • Internal Medicine

I have been very fortunate to be a physician in my home area for the past 26 years. It is a true honor to take care of so many people I have known since childhood and everyone who has given me this opportunity to be here.

Related Services

Related Practices

Specialties, Procedures &
Conditions Treated

Primary Areas of Practice

  • Gastroenterology
  • Internal Medicine

Other Areas of Practice

  • Cancer Prevention


  • Anoscopy
  • BRAVO pH Monitoring
  • Cancer Screening
  • Capsule Endoscopy
  • Colon Cancer Prevention/Screening
  • Colonoscopy
  • Endoscopy
  • Esophageal Manometry
  • Fecal Microbiota Transplant
  • Feeding Tube (Percutaneous Endoscopic Gastrostomy; PEG) Placement
  • Flexible Sigmoidoscopy
  • Hemorrhoid Ligation

Conditions Treated

  • Abdominal Pain
  • Acid Reflux
  • Anal Fissure
  • Barrett's Esophagus
  • Celiac Disease
  • Cirrhosis
  • Colitis
  • Colon Cancer
  • Colon Polyps
  • Colorectal Cancer
  • Constipation
  • Crohn's Disease
  • Diabetes
  • Diarrhea
  • Diverticulitis
  • Esophageal Cancer
  • Esophageal Disorders
  • Fatty Liver Disease
  • Gallstones
  • Gastrointestinal Bleeding
  • GERD (Gastroesophageal Reflux Disease)
  • Heartburn
  • Hemorrhoids
  • Hepatitis
  • Hyperlipidemia
  • Hypertension
  • Inflammatory Bowel Disease (IBD)
  • Irritable Bowel Syndrome (IBS)
  • Liver Disease
  • Pancreatitis
  • Peptic Ulcer Disease
  • Rectal Bleeding
  • Rectal Pain
  • Stomach Cancer
  • Stomach Disorders
  • Swallowing Disorders
  • Ulcerative Colitis

Locations &


The Park Medical Group at Tenafly


274 County Road Tenafly, NJ 07670

Phone: 201-568-0493
Fax: 201-568-0483
Monday: 1:30 PM – 5:00 PM
Tuesday: 1:30 PM – 5:00 PM
Wednesday: 1:30 PM – 5:00 PM

The Park Medical Group at Northvale


220 Livingston Street Suite 202 Northvale, NJ 07647

Phone: 201-768-9090
Fax: 201-768-9009
Monday: 1:30 PM – 5:00 PM

The Park Medical Group at Harrington Park


24 Elm Street Harrington Park, NJ 07640

Phone: 201-784-0123
Fax: 201-784-0065
Friday: 1:30 PM – 4:00 PM


Book Online


Insurances Accepted

Please contact your insurance company directly prior to receiving services or care to confirm your coverage. Although we have made every effort to ensure this list is accurate, only your health insurance plan can provide complete information regarding your coverage and potential out-of-pocket costs.

1199 (SEIU)

  • 1199 (SEIU)


  • Aetna Assure Premier Plus
  • Aetna CCN
  • Aetna CoreSource
  • Aetna Coventry
  • Aetna FIDE-SNP
  • Aetna HMO
  • Aetna Medicare Managed Care
  • Aetna POS
  • Aetna PPO
  • Aetna Whole Health HMO
  • Aetna Whole Health PPO
  • Medsolutions
  • Meritan Health


  • AmeriHealth Administrator
  • AmeriHealth HMO
  • AmeriHealth PPO
  • Value Network (Exchange Plan)


  • APWU Health Plan


  • Cigna HMO
  • Cigna Medicare Advantage
  • Cigna Open Access Plus
  • Cigna PPO
  • Cigna Supplemental
  • Great-West Healthcare (GWH)
  • Health Partners

Clover Health

  • Clover Medicare Advantage

Consumer Health Network (CHN)


Devon Health Plan

  • Devon Health Plan


  • EmblemHealth EPO
  • EmblemHealth EPO2
  • EmblemHealth FEHB
  • EmblemHealth FEHBP
  • EmblemHealth GHI CBP
  • EmblemHealth GHI PPO
  • EmblemHealth National
  • EmblemHealth PPO1
  • EmblemHealth PPO2
  • EmblemHealth PPO3
  • EmblemHealth Tri-State
  • Vytra

Empire BCBS

  • Blue Priority
  • Direct HMO
  • Direct PPO
  • Empire BCBS EPO
  • Empire BCBS GEPO
  • Empire BCBS HealthPlus Gatekeeper (prefix VFG)
  • Empire BCBS HealthPlus Gatekeeper (prefix VJD)
  • Empire BCBS HMO
  • Empire BCBS Indemnity
  • Empire BCBS Medicare Advantage
  • Empire BCBS Medicare Advantage Plus
  • Empire BCBS POS
  • Empire BCBS PPO

Empire Plan (NYSHIP)

  • Empire Plan (NYSHIP)

Fidelis Care NJ

  • Fidelis Care NJ Medicaid Managed Care

First Health

  • First Health


  • GEHA Health Plan

Horizon BCBS

  • Federal Employee Program
  • Horizon BCBS Braven Health
  • Horizon BCBS EPO
  • Horizon BCBS HMO
  • Horizon BCBS Medicare Managed Care
  • Horizon BCBS PPO
  • NJ Carpenters Fund
  • OMNIA Tier 1
  • Traditional

Horizon NJ Health

  • Horizon NJ Health Medicaid
  • Horizon NJ TotalCare (D-SNP)


  • Humana ChoiceCare Network PPO
  • Humana ChoiceCare+ Network PPO
  • Humana ChoicePOS
  • Humana Gold Choice Network PFFS
  • Humana Gold Choice Network PFFS 23
  • Humana Gold Plus DE-SNP
  • Humana Gold Plus HMO
  • Humana Medicare (Employer PPO Plus)
  • Humana Medicare PPO
  • Humana Medicare PPO 2023
  • Humana National Medicare HMO
  • Humana National POS - Open Access
  • Humana National POS - Open Access Plus


  • Local 825
  • MagnaCare PPO

Mail Handlers

  • Mail Handlers Benefit Plan (MHBP)


  • Medicaid NJ


  • Medicare NJ


  • Beech Street
  • MultiPlan Humana
  • MultiPlan Worker's Comp
  • PHCS
  • Pomco

MVP Health Care

  • MVP Health Care PPO


  • NALC Health Benefit Plan

Nippon Life Insurance Co of America

  • Nippon Life Benefits


  • Freedom
  • Garden State Network
  • Liberty
  • Metro
  • Oxford Medicare


  • Choice Care
  • Oscar
  • QualCare EPO
  • QualCare FEHB
  • QualCare GHI PPO
  • QualCare HMO
  • QualCare Humana
  • QualCare PPO
  • QualCare Worker's Comp

Railroad Medicare

  • Railroad Medicare NJ

TRICARE North Region

  • DVA


  • UMR

United Healthcare Community and State

  • Dual Complete
  • UnitedHealthcare Community and State Medicaid (NJ FamilyCare)
  • UnitedHealthcare Community and State Medicare


  • AARP
  • Commercial and Marketplace
  • Compass Benefit (Exchange)
  • Medica
  • River Valley
  • UnitedHealthcare EPO
  • UnitedHealthcare HMO
  • UnitedHealthcare POS
  • UnitedHealthcare PPO
  • UnitedHealthcare StudentResources

Wellcare NJ

  • Wellcare NJ Ambetter
  • Wellcare NJ Medicare Managed Care


  • Wellpoint Medicaid
  • Wellpoint Medicare Advantage


About Walter Klein

Dr. Klein, part of The Park Medical Group, received his MD from Weill Medical College of Cornell University. His internship and residency at NewYork-Presbyterian Hospital/Weill Cornell Medical Center included training at Memorial Sloan Kettering Cancer Center and the Hospital for Special Surgery. During his fellowship training in gastroenterology at Temple University Hospital, he conducted clinical research on esophageal disorders and had the opportunity to treat patients in an urban setting. In addition to his work with the Park Medical Group, Dr. Klein volunteers his time teaching medical and surgical residents and students as an assistant professor at the Hackensack Meridian School of Medicine at Seton Hall. He is the school physician for the Cresskill School District and the Police Surgeon for the Harrington Park and Closter Police Departments. Dr. Klein participated in medical humanitarian missions to West Africa as a Commander in the Navy Reserve and has been a volunteer physician in Haiti. He has also accompanied sick patients and their caregivers on pilgrimages to Lourdes, France, with the Order of Malta.

Honors & Awards

2004-2020: Castle Connolly Guide to Top Doctors New York Metro Area

2010-2020: Bergen Magazine Top Doctors

2012-2020: Jersey's Best Top Doctors for Cancer

2010-2020: Jersey's Best Magazine Top Doctors

2016-present: NJ Top Docs

Fellow, American College of Physicians

Fellow, American College of Gastroenterology

Global Health and Community Health Activities

Police Surgeon, Closter Police Department and Harrington Park Police Department

2011, 2013: Volunteer Physician, Hospital Sacre Coeur, Milot, Haiti

Education &

Education & Degrees

MD: Cornell University Medical College


New York Hospital


Temple University Hospital: Gastroenterology

Certifications & Distinctions

  • Gastroenterology (American Board of Internal Medicine)
  • Internal Medicine (American Board of Internal Medicine)



Klein W, Miller H, Anderson M, and DeCosse J. The Use of Indomethacin, Sulindac, and Tamoxifen for the Treatment of Desmoid Tumors Associated with Familial Polyposis. Cancer 60:2863-2868, 1987.

1991 Klein W, and Reader G. Epidemic Diseases at the New York Hospital. Bulletin of the NY Academy of Medicine, September, 1991.

1993 Klein W, Parkman H, Dempsey D, Fisher R. Sphincter-like thoraco- abdominal high pressure zone after esophagogastrectomy. Gastroenterolog 105:1362-1369, 1993. (See accompanying editorial).

1993 Klein W, Krevsky B, Klepper L, Ljubich P, Niewiarowski T, Rothstein K, Dabezies M, Fisher R. Nonsteroidal Antiinflammatory Drugs and Upper Gastrointestinal Hemorrhage in an Urban Hospital. Digestive Diseases and Sciences, 38:2049-2055, 1993.

1994 Klein W, Dabezies M, Friedman A, Caroline D, Boden G, Cohen S. Agenesis of the Dorsal Pancreas in a Patient with Weight Loss and Diabetes Mellitus. Digestive Diseases and Sciences, 39:1708-1713, 1994.