Review of Systems (ROS) Template: The 14 CMS Organ Systems, 2021/2023 E/M Rules, and HL7 FHIR Structuring

A Review of Systems (ROS) template (also referred to as a Review of Systems checklist) is a structured clinical documentation instrument used during patient intake and medical charting to inventory subjective symptoms across defined anatomical and physiological body systems. Positioned between the History of Present Illness (HPI) and the objective Physical Examination (PE) in electronic medical charting, the ROS captures pertinent positive and pertinent negative patient-reported symptoms that refine differential diagnosis, establish baseline symptom status prior to clinical trial drug administration, and support compliant Evaluation and Management (E/M) documentation.

What Should Be Included in a Review of Systems Template? The 14 CMS Organ Systems

Under the Centers for Medicare & Medicaid Services (CMS) 1995 and 1997 Evaluation and Management (E/M) Documentation Guidelines, a comprehensive Review of Systems checklist is organized around 14 recognized organ systems. Crucially, the ROS records subjective patient-reported symptoms (for example, patient denies diplopia or reports exertional dyspnea), whereas clinician-observed signs (for example, scleral icterus or basilar rales on auscultation) belong exclusively in the Physical Examination section.

#	CMS Recognized Organ System	Standard Pertinent Positive / Negative Symptom Prompts in an ROS Template
1	Constitutional Symptoms	Fever, chills, night sweats, unintentional weight loss or gain, fatigue, malaise
2	Eyes	Blurred vision, diplopia (double vision), photophobia, eye pain, redness, visual field loss
3	Ears, Nose, Mouth, Throat (ENMT)	Hearing loss, tinnitus, vertigo, epistaxis, nasal congestion, sore throat, dysphagia, hoarseness
4	Cardiovascular	Chest pain or pressure, palpitations, orthopnea, paroxysmal nocturnal dyspnea (PND), lower-extremity edema, claudication
5	Respiratory	Dyspnea (shortness of breath), chronic or productive cough, hemoptysis, wheezing, pleuritic chest pain
6	Gastrointestinal	Appetite change, nausea, vomiting, diarrhea, constipation, abdominal pain, hematochezia, melena, jaundice
7	Genitourinary	Dysuria, urinary frequency, urgency, nocturia, hematuria, incontinence, flank pain, pelvic or reproductive symptoms
8	Musculoskeletal	Arthralgias (joint pain), joint swelling, myalgias, morning stiffness, back or neck pain, decreased range of motion
9	Integumentary (Skin & Breast)	Rash, pruritus (itching), changing moles or skin lesions, non-healing ulcers, alopecia, breast mass or nipple discharge
10	Neurological	Headaches, syncope or presyncope, seizures, focal weakness, paresthesias (numbness/tingling), tremor, gait instability
11	Psychiatric	Depressed mood, anhedonia, anxiety, panic attacks, insomnia, memory impairment, suicidal or homicidal ideation
12	Endocrine	Heat or cold intolerance, polydipsia (excessive thirst), polyuria, polyphagia, unexplained hair or skin changes
13	Hematologic / Lymphatic	Easy bruising, prolonged bleeding, petechiae, lymphadenopathy (swollen lymph nodes), history of thromboembolism
14	Allergic / Immunologic	Seasonal allergic rhinitis, urticaria (hives), angioedema, recurrent opportunistic infections, autoimmune flares

CMS 1995/1997 Tiers vs. 2021/2023 AMA E/M Documentation Reforms

Clinical documentation integrity (CDI specialist) teams and medical coders evaluate ROS templates differently depending on whether an audit applies legacy 1995/1997 rules or the modernized 2021/2023 AMA CPT E/M guidelines:

• Legacy 1995/1997 CMS E/M Counting Rules: Historically, E/M level selection required counting documented ROS systems: a Problem Pertinent ROS required 1 system; an Extended ROS required 2 to 9 systems; and a Complete ROS required reviewing at least 10 of the 14 organ systems (or documenting pertinent positives and negatives alongside an explicit attestation that “all other systems were reviewed and are negative”). This requirement frequently led to “note bloat,” where clinicians inserted default 14-system negative macros into every encounter note.
• 2021 (Outpatient) and 2023 (Inpatient, ED, Observation, Nursing Facility) AMA/CMS E/M Reforms: Effective January 1, 2021 for office/outpatient visits (CPT 99202–99215) and January 1, 2023 across hospital inpatient, emergency department, and facility settings, AMA and CMS eliminated the 10-system ROS counting mandate for E/M code level selection. Code levels are now determined solely by Medical Decision Making (MDM) or Total Time on the date of the encounter, requiring only a “medically appropriate history and/or physical examination.” Modern EHR ROS templates therefore prioritize problem-focused, clinically pertinent symptom capture and contradiction auditing (ensuring an auto-populated negative ROS does not contradict symptoms described in the HPI).

How Is a Review of Systems Template Structured in EHR Workflows?

In contemporary enterprise EHRs and clinical informatics pipelines, the Review of Systems template is captured and exchanged through three technical mechanisms:

1. Pre-Visit Digital Patient Questionnaires (HL7 FHIR Questionnaire and LOINC): Before the appointment, patients complete a mobile or portal intake checklist modeled as an HL7 FHIR R4 Questionnaire resource. Responses are returned as a structured QuestionnaireResponse bound to LOINC code 71406-3 (CMS Review of Systems Panel) and LOINC 10187-3 (Review of systems Narrative – Reported) in C-CDA and FHIR clinical documents. Per CMS E/M guidelines, a clinician may review and attest to a patient-completed or ancillary-staff-recorded ROS rather than re-typing every item manually.
2. Speech Recognition and Ambient AI Medical Scribes: Clinicians dictating via Dragon Medical One voice auto-texts or using ambient AI documentation platforms such as Ambience Healthcare and Abridge AI capture ROS findings conversationally during the patient interview. Ambient AI models extract only the organ systems and symptoms actually discussed in the room, preventing unverified template cloning where a macro erroneously documents “denies chest pain” or “normal gait” when those questions were never asked.
3. Clinical Trial Baseline Symptom Logs: In Phase I–III clinical trials, investigative sites use standardized ROS checklists at the Screening and Day 1 pre-dose visits to establish a comprehensive baseline medical history and pre-existing symptom inventory, ensuring that pre-existing chronic symptoms are not misclassified later as treatment-emergent adverse events (TEAEs).

Frequently Asked Questions

What should be included in a Review of Systems template?

A comprehensive Review of Systems (ROS) template covers the 14 CMS-recognized organ systems: Constitutional, Eyes, Ears/Nose/Mouth/Throat (ENMT), Cardiovascular, Respiratory, Gastrointestinal, Genitourinary, Musculoskeletal, Integumentary (skin/breast), Neurological, Psychiatric, Endocrine, Hematologic/Lymphatic, and Allergic/Immunologic. For each system evaluated, the template records subjective patient-reported pertinent positives and pertinent negatives.

How is a Review of Systems template structured in EHR workflows?

In modern EHRs, an ROS template is structured as discrete boolean or coded symptom elements bound to LOINC 71406-3 (CMS Review of Systems Panel) and LOINC 10187-3 within HL7 FHIR Questionnaire and QuestionnaireResponse resources. Following the 2021/2023 AMA and CMS E/M documentation reforms, EHR templates emphasize medically appropriate, problem-focused symptom capture—often populated via pre-visit patient portals or ambient AI scribes—rather than mandatory 10-system macro checklists.