L3: Care setting

Resolve place of service codes, modifier requirements, and facility vs. non-facility payment rates

Layer 3 determines the care setting context — where the service is actually being delivered — which directly affects place of service (POS) codes, required modifiers, and whether the facility or non-facility PE RVU applies to the payment calculation.

How L3 depends on L2

L3 uses the facility type from L2 to infer a default care setting when you don’t specify one:

L2 facility type	Default care setting	POS code
Short-term acute / CAH	inpatient	21
Home health	home_health	12
SNF	snf	31
FQHC	office	50
Other	outpatient	22

You can override the default by passing care_setting in the resolve request — for example, a short-term hospital may deliver services in an outpatient department (POS 22) rather than inpatient (POS 21).

Request

curl https://api-dev.rcintell.com/v1/knowledge/layers/170001/l3 \
  -H "X-API-Key: $RCI_API_KEY"

Or within a full resolution with an explicit care setting:

curl -X POST https://api-dev.rcintell.com/v1/knowledge/resolve \
  -H "X-API-Key: $RCI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "ccn": "170001",
    "cpt": "99213",
    "care_setting": "outpatient"
  }'

Response

{
  "layer": "l3_care_setting",
  "data": {
    "care_setting": "outpatient",
    "place_of_service": [
      {
        "name": "On Campus - Outpatient Hospital",
        "description": "Hospital-based outpatient",
        "facility_indicator": true
      }
    ],
    "modifier_requirements": [
      "Site-of-service differential applies",
      "May need modifier 27"
    ],
    "typical_tob": "013x",
    "admission_required": false
  }
}

Place of Service codes

POS codes tell the payer where the service was rendered:

POS	Name	Facility?	Payment impact
11	Office	No	Non-facility PE RVU (higher payment)
12	Home	No	Non-facility PE RVU
21	Inpatient Hospital	Yes	Facility PE RVU (lower payment)
22	Outpatient Hospital	Yes	Facility PE RVU
23	Emergency Room	Yes	Facility PE RVU
31	SNF	Yes	Facility PE RVU
50	FQHC	Yes	All-inclusive rate

The “Facility?” column determines which PE RVU is used in the L6 payment calculation. Facility settings use the lower PE RVU because the facility absorbs overhead costs. Non-facility settings use the higher PE RVU because the physician’s practice bears those costs.

Site-of-service differential

The same CPT code pays differently depending on the POS. For CPT 99213:

Setting	PE RVU	Total payment (KS)
Hospital outpatient (POS 22)	0.99 (facility)	$75.00
Physician office (POS 11)	1.81 (non-facility)	$102.35

The $27.35 difference is the site-of-service differential. This reflects that hospital-based physicians don’t bear the same overhead as office-based physicians — the hospital does.

Billing an office visit (POS 11) when the service was actually rendered in a hospital outpatient department (POS 22) is a compliance risk. POS must match the actual location of service.

Modifier requirements by setting

Each care setting has specific modifier rules:

Care setting	Common modifiers	Notes
Inpatient	25, 59	Distinct services need modifier separation
Outpatient	27	Outpatient hospital E/M on same day as procedure
Home health	—	LUPA adjustments apply for low-utilization episodes
SNF	—	Part A consolidated billing applies during covered stay
Office	—	Non-facility rate applies; standard E/M rules

Care setting values

Pass one of these values in the care_setting parameter:

Value	Description
inpatient	Acute inpatient admission
outpatient	Hospital outpatient department
office	Physician or provider office
home_health	Patient’s home (home health episode)
snf	Skilled nursing facility stay