G0035 ED Encounter (HCPCS) Reimbursement | OpenPayer

Summary & Overview

HCPCS G0035: Emergency Department Encounter, Place of Service 23

HCPCS Level II code G0035 denotes that a patient had any emergency department encounter during the performance period with place of service indicator 23. This designation matters nationally because emergency department utilization is a key driver of acute-care delivery metrics, payment triggers, and population health monitoring. Recording ED encounters with a distinct HCPCS Level II code supports claims processing, utilization tracking, and program eligibility determinations across payers.

Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise review of what G0035 captures, how it aligns with emergency department service reporting, and the payer landscape relevant to claims adjudication. The publication outlines common benchmarks and policy context for ED encounter coding, notes typical billing considerations, and summarizes where additional clinical or coding detail may be required.

This national-level summary is intended for billing managers, compliance officers, and policy analysts seeking an overview of the code’s purpose, common payment stakeholders, and the types of reporting and monitoring tasks for which G0035 is used. Data not available in the input are identified explicitly so readers know where to seek supplemental details.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareG0035HCPCS Level IIemergency departmentplace of service 23utilizationclaims codingperformance periodacute care

Billing Code Overview

HCPCS Level II code G0035 indicates that a patient had any emergency department encounter during the performance period with place of service indicator 23. This code represents an encounter-based service type tied to emergency department use and is recorded when services occur in the emergency department setting.

Service type: Emergency department encounter
Typical site of service: Emergency department (place of service 23)

Data not available in the input for associated taxonomies, ICD-10 diagnoses, and related codes.

Clinical & Coding Specifications

Clinical Context

A patient presents to the emergency department (ED) with an acute complaint such as chest pain, shortness of breath, severe abdominal pain, altered mental status, or traumatic injury. During triage and initial evaluation in the ED (place of service 23), clinicians document an ED encounter for urgent assessment, stabilization, diagnostic testing (labs, ECG, imaging), and treatment. The encounter includes initial history and physical, medical decision-making to determine level of care, and disposition planning (admission, observation, transfer, or discharge). The billing code G0035 is used to indicate that the patient had any ED encounter during the performance period with place of service 23. Typical workflow: patient arrival → triage and vital signs → ED clinician evaluation → orders for diagnostics and treatments → procedures as indicated (e.g., wound care, splinting, point-of-care ultrasound) → reassessment and disposition decision. Documentation must include ED location (place of service 23), time of encounter, presenting symptoms, relevant exam findings, decision-making rationale, and disposition.

Coding Specifications

Modifier	Description	When to Use
`23`

HCPCS G0246: Follow-up E/M for Diabetic Sensory Neuropathy with LOPS

HCPCS-G9959-SYSTEMIC-ANTIMICROBIALS-NOT-PRESCRIBED

HCPCS G9959: Systemic Antimicrobials Not Prescribed

HCPCS-G9401-GENOTYPE-INFORMED-TREATMENT-DOCUMENTATION-MISSING

HCPCS G9401: Missing Documentation of Genotype-Informed Treatment Discussion

HCPCS-G8865-PNEUMOCOCCAL-VACCINE-MEDICAL-REASON-NOT-ADMINISTERED

HCPCS G8865: Documentation of Medical Reason for Not Administering Pneumococcal Vaccine

HCPCS-G9875-MDPP-NINE-CORE-SESSIONS-EXPANDED-MODEL

HCPCS G9875: MDPP Nine Core Sessions, Expanded Model

HCPCS-G9818-SEXUAL-ACTIVITY-DOCUMENTATION

HCPCS G9818: Documentation of Sexual Activity

HCPCS-G4034-SPEECH-LANGUAGE-PATHOLOGY-MIPS-SPECIALTY-SET

HCPCS G4034: Speech Language Pathology MIPS Specialty Set

HCPCS-G0413-PERCUTANEOUS-POSTERIOR-PELVIC-FIXATION

HCPCS G0413: Percutaneous Fixation of Posterior Pelvic Fracture

HCPCS-G8782-COUNSELING-DIET-PHYSICAL-ACTIVITY-NOT-PERFORMED

HCPCS G8782: Counseling for Diet and Physical Activity Not Performed

HCPCS-G8560-EAR-DRAINAGE-HISTORY-90-DAYS

HCPCS G8560: History of Active Ear Drainage within 90 Days

Showing 1–10 of 1996

Taxonomy Code	Specialty	Notes
207P00000X	Emergency Medicine Physician	ED physicians document and bill ED encounters and related services at place of service `23`.
363L00000X	Physician Assistant	PAs commonly assist in ED procedures and evaluations; use applicable modifiers when billing.
183P00000X	Nurse Practitioner	NPs frequently provide ED evaluation and management and minor procedures.
207R00000X	Anesthesiology	Anesthesiologists may be involved when unusual anesthesia (`23`) is required in the ED.
2084P0800X	General Surgery	Surgeons may be consulted from the ED for acute surgical conditions and procedures.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`R07.9`	Chest pain, unspecified	Common presenting symptom prompting an ED encounter and diagnostic evaluation.
`R06.02`	Shortness of breath	Frequent acute complaint leading to ED assessment, monitoring, and interventions.
`K52.9`	Noninfective gastroenteritis and colitis, unspecified	Represents acute abdominal illness that may trigger ED evaluation.
`S39.012A`	Strain of muscle, fascia and tendon of lower back, initial encounter	Example traumatic/musculoskeletal complaint evaluated and treated in the ED.
`S01.01XA`	Laceration without foreign body of scalp, initial encounter	Typical injury requiring immediate ED wound care, suturing, and possible imaging.
`T81.4XXA`	Infection following a procedure, initial encounter	Possible complication identified during or after an ED visit requiring treatment.
`F41.9`	Anxiety disorder, unspecified	Psychiatric presentation that may lead to ED evaluation and disposition planning.
`I63.9`	Cerebral infarction, unspecified	Serious neurologic presentation that commonly results in urgent ED evaluation and triage.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`99281`	Emergency department visit for the evaluation and management of a patient, problem-focused history and examination; straightforward medical decision making	Low-complexity ED evaluation that may be billed when the ED encounter documented matches level `99281`.
`99283`	Emergency department visit for the evaluation and management of a patient, expanded problem-focused history and examination; moderate medical decision making	Commonly billed for typical ED encounters requiring diagnostic workup and treatment during the `G0035` performance period.
`99285`	Emergency department visit for the evaluation and management of a patient, comprehensive history and examination; high medical decision making	Used for severely ill or high-acuity patients evaluated and managed in the ED under place of service `23`.
`10060`	Incision and drainage of abscess; simple or single	Example of a procedure that may occur during an ED encounter and be billed alongside ED evaluation codes.
`12001`	Simple repair of superficial wounds of scalp, neck, axillae, external genitalia, trunk and/or extremities; 2.5 cm or less	Common minor surgical procedure performed in the ED during the encounter represented by `G0035`.
`71045`	Radiologic examination, chest; single view, frontal	Typical diagnostic test ordered and performed during an ED visit for chest complaint, related to the ED encounter.

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