On July 1974, the Department of Health approved the increase in the hospital accommodation from 50 to 75 beds. A Master Development Plan was completed by the Bureau of Public Works in coordination with the Provincial Architect of the Rizal Province. It consisted of a 50-bed Medicare Building, a Nurse Dormitory and an Out-patient Department Building. Construction of the Medicare Building was completed and inaugurated on May 12, 1976. After four years, the combined Pediatrics and Medicine Wards was inaugurated.
In CY 1977, ERSMH became a 100-bed tertiary provincial hospital and started departmentalization in CY 1979.
On May 1, 1984, the hospital started its participation in the Internship Training Program of the Association of the Philippine Medical Colleges (APMC).
Executive Order No. 119 dated January 20, 1987 which mandated the reorganization of the Department of Health and attached agencies, ushered the birth of the National Capital Region (NCR) for Health - the 13th region. Eulogio Rodriguez Sr. Memorial Hospital which used to operate under the umbrella of Regional Health Office No. IV became the hospital component of the District Health Office No. II of the NCR in line with the concept of Integration.
In CY 1992, the late Cong. Democlito Angeles sponsored a House Bill for the increase of the bed capacity of the hospital to 150 beds under RA 7209 and subsequently, thru RA 8019 sponsored by Cong. Romeo Candazo of the then Lone District of Marikina, which upgraded the hospital into a Medical Center and renaming it into Amang Rodriguez Medical Center (ARMC). It was approved on November 24, 1995.
New infrastructure development started in CY 1999, and ARMC became a recipient of the French Protocol Services for technical advice and assistance on the design, procurement, implementation and follow-up of the medical equipment plan, upgrading the hospital's equipment and facilities. Manpower development was made with the hospital offering sub-specialty services and the different medical departments accrediting their residency training programs with the different respective specialty societies.
To date, the infrastructure development and equipment upgrading of the hospital is continuously being implemented. In May 2005, the Congress Health Committee passed House Bill 1352 authored by Cong. Del R. de Guzman, increasing the hospital bed capacity to 300 beds.
On February 19, 2007, R.A. 9419 sponsored by Cong. Del R. de Guzman, an Act Increasing the Bed Capacity of the Amang Rodriguez Memorial Medical Center from One Hundred Fifty (150) to Three Hundred (300) Beds and Appropriating Funds Therefor was approved. However, the hospital implemented gradually a 211-bed capacity despite inadequate budgetary allocation for personnel and other operating expenses. To augment manpower services, the hospital opted for hiring of contractual employees. Despite the limited budget and resources, ARMMC has developed into an institution recognized for its pro-poor advocacy, its competent professional staff, quality training programs and outstanding research.
As part of the Department of Health - Hospital System, ARMMC is a public hospital under the national government with a diversified and integrated health service including education and research providing full range of medical services.
The hospital, located along Barangay Sto. Nino, Sumulong Highway, Marikina City, was founded in 1964 purposely to provide the necessary health needs of Marikina and the adjoining towns and municipalities of Rizal province. Through the years, the hospital became fully departmentalized and equipped with services in the field of Medicine, Pediatrics, Obstetrics-Gynecology, Surgery, Anesthesia, their subspecialty and Ancillary services such as Pathology, Radiology and Dental Services. It was upgraded into a Medical Center in 1995 under Republic Act No. 8019.
The ARMMC caters not only to the people of Marikina but also to the neighboring towns of Rizal, like Antipolo, San Mateo, Cainta, Rodriguez, Pasig City, Quezon City and other parts of Metro Manila and other provinces. Since this hospital is the nearest medical center in the Eastern part of Rizal, it becomes the referral center for more complicated cases.