Medical Billing

# What is POS 23 in Medical Billing?

- May 12, 2025
- Posted by Brian Bertrand

12 May

Medical billing needs to be accurate for timely reimbursements as well as compliance in healthcare. The Place of Service (POS) code is one of the important aspects that identify where a service was rendered. Among these, POS 23 is commonly used in hospitals in emergency care.

The Place of Service (POS) code is one of the major requirements of the process, identifying the service location. POS 23 among many POS codes in the US stands out because of services given in an emergency room (ER). In this piece, we’ll look at what POS 23 is, how it’s used in billing, and why it is important for both healthcare providers and insurers.

## What Is POS 23 in Medical Billing?

POS 23 in medical billing means Emergency Room – Hospital. This code is used when a patient is served by a healthcare provider in an emergency department of a hospital. It is one of multiple POS codes developed by the Centers for Medicare & Medicaid Services (CMS) to find the location of medical services.

### Official Definition:

POS 23 – Emergency Room – Hospital. A section of a hospital through which emergency diagnostic and care for illness or injury are provided.

If a provider provides services to a patient in an ER, POS 23 must be reflected on the health insurance claim form (usually the CMS-1500 form), indicating a hospital-based emergency setting for the service provided.

## The Role of POS Codes in Medical Billing

POS codes are two-digit codes used on claims to denote the place where a service was rendered. These codes need to be shown on CMS-1500 forms and help the payers to understand:

- Reimbursement amounts (calculated based on the cost structure of the setting),
- Provider qualifications for certain locations,
- Medical necessity, and
- Compliance with insurance rules.

Every POS code correlates with a reimbursement structure since the cost of delivering care differs from setting to setting. For instance, care in an ER (POS 23) is more expensive than in a physician’s office (POS 11), and insurers adjust their reimbursement, depending on the venue.

### Examples of POS Codes in Medical Billing

Every code plays a very important role in deciding coverage and reimbursement. To get a grasp of where POS 23 fits in the larger picture, a couple more common codes are:

POS Code | Place of Service | Description
11 | Office | Services performed in a physician’s office
15 | Mobile Unit | Diagnostic or treatment unit traveling to locations
20 | Urgent Care Facility | Non-emergency treatment outside of the ER
21 | Inpatient Hospital | Services provided to a hospital inpatient
23 | Emergency Room – Hospital | Emergency services are provided in a hospital ER
24 | Ambulatory Surgical Center | Outpatient surgery center
02 | Telehealth | Synchronous services are provided via telecommunications

## When Is POS 23 Used?

POS 23 is to be used only if:

- Services were offered in a hospital emergency room;

The services were for emergent or urgent care needs.

- The provider is licensed to work in a hospital emergency environment.

POS 23 should not be misused. In the same way, if a provider attends to a patient in an urgent care clinic (which may be similar to an ER), POS 20 (Urgent Care Facility) is used.

### Who Uses POS 23?

POS 23 is typically used by:

- Emergency physicians,
- Hospital-based providers,
- Radiologists, pathologists, and specialists who study the diagnostics of ER,
- Nurses / mid-level providers submitting claims for emergency services.

In all these workers, POS 23 must be correctly represented on their claim forms when services given are at emergency department.

### Why Is POS 23 Important?

### 1. Accurate Reimbursement

Billing the right POS is important to get a correct payment. Facilities provided in a hospital ER are normally reimbursed at higher rates because of:

- Round-the-clock staffing,
- Availability of complex diagnostics,
- Immediate life-saving interventions.

It is possible to underpay using POS 11 (office) instead of POS 23.

### 2. Claim Integrity

Inaccurate POS coding can initiate audits, denials of claims, or fraud investigations. POS 23 indicates the patient received urgent or emergent care, and the claim fits that scene.

### 3. Patient Context

It puts the payer in context about the patient’s status, and most ER visits are acute or emergent (chest pain, trauma, or severe infections). This affects whether the diagnosis & how treatment codes correlate with the setting & urgency.

### How to Bill Using POS 23

When filing a claim with POS 23, attach:

- Issue correct CPT or HCPCS codes for the services rendered.
- Code of diagnosis (ICD-10) that confirms medical necessity of ER treatment;
- Provider’s NPI and hospital affiliation;
- POS 23 in the field marked CMS-1500.

### Example:

When an emergency physician was given a patient with severe abdominal pain to treat:

- CPT code: 99285 (Emergency department visit, high severity),
- ICD-10 code: R10.9 (Unspecified abdominal pain),
- POS: 23.

### Common Mistakes with POS 23

1. Using POS 23 for Non-ER Settings: No emergency care clinic/outpatient center/office shall make use of POS 23.
2. Incorrect Provider Type: POS 23 can only be billed by authorized providers practicing or affiliated with the ER.
3. Missing Supporting Documentation: Denials can result from a lack of medical necessity or inappropriate diagnosis codes.

### Compliance and Audits

Amounts attributed to incorrect POS codes may be:

- Overpayments, which must be refunded,
- Claim denials,
- Reduction in fines for fraud or abuse.

POS may be audited by Medicare and private payers to check if it really corresponds to the actual service location. Recruitment and documentation must be superb and internal audit strictly observed, to ensure that providers remain compliant.

### POS 23 vs. Other Emergency-Related POS Codes

Let’s compare POS 23 with POS 20 and POS 11 to illustrate when to use each:

Scenario | Correct POS Code | Why
Patient seen for chest pain in the hospital ER | 23 | Emergency services are provided in the hospital ER
Patient seen for flu symptoms in urgent care | 20 | Non-emergency treatment in an urgent care clinic
Routine follow-up for high blood pressure | 11 | Physician’s office visit

## POS 15 in Medical Billing

POS 15 in Medical Billing – Mobile Unit is used in the case of the delivery of healthcare services from a mobile diagnostic or treatment unit. This includes such vans or mobile labs which go to the places where the patients are situated, like in the rural areas or the worksites. It is important in the case of outreach and public health programs.

## POS 20 in Medical Billing

When services are provided in a facility set up to manage non-life-threatening, urgent conditions, without an appointment, the POS 20 – Urgent Care Facility is applied. It’s kind of a middle ground between a standard office (POS 11) and an emergency room (POS 23), but with extra hours and walk-in.

## POS 21 in Medical Billing

When one finds himself or herself admitted to a hospital for inpatient care, then POS 21 in Medical Billing – Inpatient Hospital is applied. This code includes those services which demand an overnight stay with constant clinical supervision on grounds of surgery recovery, severe infection or even cardiac events.

## POS 11 in Medical Billing

POS 11 in Medical Billing – Office is defined as services offered in a standard physician’s office or clinic. That’s the most popular POS code and is used for routine checkups, follow-ups, as well as outpatient diagnostics or treatments.

## POS in Medical Billing

POS (Place of Service) codes are two digit numbers on claim forms to indicate the site of the provision of a healthcare service. They are essential for reimbursement rate decisions as there are cost structures in different settings.

## POS 02 in Medical Billing

Telehealth provided other than in Patient’s Home is designated as POS 02 – Telehealth Provided Other Than in Patient’s Home: when a provider delivers virtual care other than in the patient’s home (e.g. clinic, hospital). It guarantees that one will still be able to bill for remote care services to the payers.

## POS 24 in Medical Billing

POS 24 Ambulatory Surgical Center (ASC) is a same-day outpatient surgery center where no hospitalization is required. Services offered here are often less complicated & less costly as compared to inpatient procedures.

### Conclusion

POS 23 in medical billing refers to emergency treatment administered in a hospital, and its correct use is important for correct reimbursement as well as regulatory adherence. Such misuse of this code can cause underpayment of the tax, filing of denied claims, or audits. Similarly, awareness of related POS codes (POS 11 (office), POS 20 (acute), and POS 21 (hospital)) assists us in making sure that services are coded to the correct setting of service delivery.

## Frequently Asked Questions

### What does POS 23 mean?

POS 23 means emergency room-hospital, places where emergency care is provided in the ER of a hospital.

### When will POS 23 be applied to a claim?

Use POS 23 only for services delivered on site in hospital emergency departments; not urgent care or outpatient clinics.

### May I use POS 23 for telehealth visits?

No. Telemedicine should use POS 02 or POS 10, depending on where the patient resides during the televisit.

### How do POS 23 and POS 20 compare?

POS 23 is for the hospital ERs and POS 20 is for stand-alone urgent care centers, not connected to a hospital ER.

### Does an incorrect POS code affect reimbursement?

Yes. Wrong POS codes may result in underpayment, denial of claim, or worse, a compliance audit.

### Are both Medicare and private insurance taking POS 23?

Yes. POS 23 is a standard CMS code which is used throughout Medicare, Medicaid, and commercial insurance plans.

### Can lab services, which are ordered from the ER, use POS 23?

Yes, if the lab work is a component of the ER encounter. Otherwise, a suitable POS for this lab environment might be utilized.

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