About US

Atlas IPA is a CMS-approved accountable care organization (ACO) that is participating in the ACO Realizing Equity, Access, and Community Health (ACO REACH) model. As an ACO, Atlas offers high quality health care and other supportive benefits designed to improve the quality of life for high risk and high needs Medicare patients living throughout the Bronx, Brooklyn, Manhattan, Queens, Staten Island, Nassau and Westchester counties.


Atlas IPA is part of practice management of Essen Health Care. It leads payors negotiations, and supports the practice with credentialing and IT solutions needed for the optimal care of patients. It supports providers within and outside Essen with compliance regulations, administrative contracts and other overhead issues. The Independent Practice Association (IPA) aligns providers with a variety of goals including improving quality of care and reducing cost

ACO Name and Location:

2616 Halperin Avenue
Bronx, NY 10461
(718) 561-2121

Primary Contact Information for ACO REACH:

Kathryn Santos
Assistant Vice President, Quality Operations

Preferred Providers:

Essen Medical Associates

Essen Medical Urgicare PLLC

Participant Providers:

click to see full list

Identification of all joint ventures between or among the ACO and any of its ACO REACH Participant Providers and Preferred Providers:


Key Clinical and Administrative Leaders:

Clinical Leaders:

Muhammad Imran Mir,
Chief Clinical Officer, House Call Medical Services

Nikolaos Migias,
Medical Director, House Call Medical Services

Administrative leader:

Imelda Tavas,
Chief Administrative Officer, Essen Health Care

Kathryn Santos,
Assistant Vice President, Quality Operations, Essen Health Care

Sagar Panchal,
Clinical Operations Manager, Population Health, Essen Health Care

Governing Body

Leadership Team Member Position/Role at Essen Health Care Employed By
Imelda Tavas Chief Administrative Officer Essen Health Care
Muhammad Imran Mir Chief Clinical Officer, House Calls Essen Health Care
Silvio Goris Senior Medical Director, Office Division Essen Health Care
Nikolaos Migias, MD Medical Director, House Calls Essen Health Care
Diane Cooper Consumer Advocate Caregiver’s Outreach Mentorship Empowerment, Inc. (COME)
Yvette Ramos Beneficiary Representative Not employed by Essen Health Care

Shared Savings and Shared Losses:

PY 2022

  • Shared savings: 100%

Proportion of shared savings invested in infrastructure, redesigned care processes, and other resources necessary to improve outcomes and reduce Medicare costs for Beneficiaries:

  • Infrastructure (IT and Transportation) - 40%
  • Redesigned Care Processes - 35%
  • Care Management Program - 15%

Proportion of shared savings distributed to Participant Providers and Preferred Providers:

  • Participant Provider Quality Bonus - 10%

PY 2023

  • Not applicable until after PY 2023

Quality Measure Performance:

PY 2022

  • Risk-Standardized, All-Condition Readmission (ACR)
    (a lower score indicates better performance) = 20.86
  • Risk-Standardized, All-Cause Unplanned Admissions for Patients with
    Multiple Chronic Conditions (UAMCC) (per 100 person-years)
    (a lower score indicates better performance) = 79.75
  • Days at Home for Patients with Complex, Chronic Conditions (DAH)
    (a higher score indicates better performance) = 309.84
    Total Quality Score = 92%

PY 2023

  • Not applicable until after PY 2023