DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

Z03 Encounter for medical observation for suspected diseases and conditions ruled out

  • Header · not billable

Z03 is not billable. The category heads 14 billable codes in FY2027, grouped under 3 subdivisions.

Index → code

  • Suspected condition, ruled outfetal growth → Z03.74
  • Suspected condition, ruled outfetal anomaly → Z03.73
  • Suspected condition, ruled outpolyhydramnios → Z03.71

Where it sits

  1. Chapter 21 Factors influencing health status and contact with health services (Z00-Z99)
  2. Z00-Z13 Persons encountering health services for examinations (Z00-Z13)
  3. Z03 Encounter for medical observation for suspected diseases and conditions ruled out
Billable codes
14
Subdivisions
3
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
43

Codes in Z03

  1. Z03.6
    Encounter for observation for suspected toxic effect from ingested substance ruled out
    BillableExempt
    Inclusion terms 2

    Inclusion terms

    • Encounter for observation for suspected adverse effect from drug
    • Encounter for observation for suspected poisoning
  2. Z03.7
    Encounter for suspected maternal and fetal conditions ruled out
    Header
    Inclusion terms 1, Excludes1 1

    Inclusion terms

    • Encounter for suspected maternal and fetal conditions not found

    Excludes1

    • known or suspected fetal anomalies affecting management of mother, not ruled out (O26.-, O35.-, O36.-, O40.-, O41.-) O26 O35 O36 O40 O41
  3. Z03.71
    Encounter for suspected problem with amniotic cavity and membrane ruled out
    BillableExempt
    Inclusion terms 2

    Inclusion terms

    • Encounter for suspected oligohydramnios ruled out
    • Encounter for suspected polyhydramnios ruled out
  4. Z03.72
    Encounter for suspected placental problem ruled out
    BillableExempt
  5. Z03.73
    Encounter for suspected fetal anomaly ruled out
    BillableExempt
  6. Z03.74
    Encounter for suspected problem with fetal growth ruled out
    BillableExempt
  7. Z03.75
    Encounter for suspected cervical shortening ruled out
    BillableExempt
  8. Z03.79
    Encounter for other suspected maternal and fetal conditions ruled out
    BillableExempt
  9. Z03.8
    Encounter for observation for other suspected diseases and conditions ruled out
    Header
  10. Z03.81
    Encounter for observation for suspected exposure to biological agents ruled out
    Header
  11. Z03.810
    Encounter for observation for suspected exposure to anthrax ruled out
    BillableExempt
  12. Z03.818
    Encounter for observation for suspected exposure to other biological agents ruled out
    BillableExempt
  13. Z03.82
    Encounter for observation for suspected foreign body ruled out
    Header
    Excludes1 3, Excludes2 5

    Excludes1

    • retained foreign body (Z18.-) Z18
    • retained foreign body in eyelid (H02.81) H02.81
    • residual foreign body in soft tissue (M79.5) M79.5

    Excludes2

    • confirmed foreign body ingestion or aspiration including:
    • foreign body in alimentary tract (T18) T18
    • foreign body in ear (T16) T16
    • foreign body on external eye (T15) T15
    • foreign body in respiratory tract (T17) T17
  14. Z03.821
    Encounter for observation for suspected ingested foreign body ruled out
    BillableExempt
  15. Z03.822
    Encounter for observation for suspected aspirated (inhaled) foreign body ruled out
    BillableExempt
  16. Z03.823
    Encounter for observation for suspected inserted (injected) foreign body ruled out
    BillableExempt
    Inclusion terms 3

    Inclusion terms

    • Encounter for observation for suspected inserted (injected) foreign body in eye ruled out
    • Encounter for observation for suspected inserted (injected) foreign body in orifice ruled out
    • Encounter for observation for suspected inserted (injected) foreign body in skin ruled out
  17. Z03.83
    Encounter for observation for suspected conditions related to home physiologic monitoring device ruled out
    BillableExempt
    Inclusion terms 5, Excludes1 5

    Inclusion terms

    • Encounter for observation for apnea alarm without findings
    • Encounter for observation for bradycardia alarm without findings
    • Encounter for observation for malfunction of home cardiorespiratory monitor
    • Encounter for observation for non-specific findings home physiologic monitoring device
    • Encounter for observation for pulse oximeter alarm without findings

    Excludes1

    • apnea NOS (R06.81) R06.81
    • neonatal bradycardia (P29.12) P29.12
    • newborn apnea (P28.4-) P28.4
    • primary sleep apnea of newborn (P28.3-) P28.3
    • sleep apnea (G47.3-) G47.3
  18. Z03.89
    Encounter for observation for other suspected diseases and conditions ruled out
    BillableExempt

Sources of each column.

Instructions

At Z03

Inclusion terms

  • This category is to be used when a person without a diagnosis is suspected of having an abnormal condition, without signs or symptoms, which requires study, but after examination and observation, is ruled out. This category is also for use for administrative and legal observation status.

Excludes1

  • contact with and (suspected) exposures hazardous to health (Z77.-) Z77
  • encounter for observation and evaluation of newborn for suspected diseases and conditions ruled out (Z05.-) Z05
  • person with feared complaint in whom no diagnosis is made (Z71.1) Z71.1
  • signs or symptoms under study- code to signs or symptoms

Notes that also apply

Block Z00-Z13 instructions (Notes 1, Excludes2 1): printed on the block page.

Chapter 21 instructions (Notes 3): printed on the chapter 21 page.

Index entries

  • Observation (following) (for) (without need for further medical care)adverse effect of drug → Z03.6
  • Observation (following) (for) (without need for further medical care)toxic effects from ingested substance (drug) (poison) → Z03.6
  • Self-poisoningobservation following (alleged) attempt → Z03.6
  • Suspected condition, ruled outamniotic cavity and membrane → Z03.71
  • Suspected condition, ruled outoligohydramnios → Z03.71
  • Suspected condition, ruled outpolyhydramnios → Z03.71
  • Suspected condition, ruled outplacental problem → Z03.72
  • Suspected condition, ruled outfetal anomaly → Z03.73
  • Suspected condition, ruled outfetal growth → Z03.74
  • Suspected condition, ruled outcervical shortening → Z03.75
  • Suspected condition, ruled outmaternal and fetal conditions NEC → Z03.79
  • Mentalobservation without need for further medical care → Z03.89
  • Observation (following) (for) (without need for further medical care)disease, specified NEC → Z03.89
  • Observation (following) (for) (without need for further medical care)suicide attempt, alleged NEC → Z03.89
  • Observation (following) (for) (without need for further medical care)suicide attempt, alleged NECself-poisoning → Z03.6
  • Observation (following) (for) (without need for further medical care)suspected, ruled outdrug poisoning or adverse effect → Z03.6
  • Observation (following) (for) (without need for further medical care)suspected, ruled outtoxic effects from ingested substance (drug) (poison) → Z03.6
  • Encounter (with health service) (for)suspected condition, ruled outamniotic cavity and membrane → Z03.71
  • Encounter (with health service) (for)suspected condition, ruled outoligohydramnios → Z03.71
  • Encounter (with health service) (for)suspected condition, ruled outpolyhydramnios → Z03.71
  • Encounter (with health service) (for)suspected condition, ruled outplacental problem → Z03.72
  • Encounter (with health service) (for)suspected condition, ruled outfetal anomaly → Z03.73
  • Encounter (with health service) (for)suspected condition, ruled outfetal growth → Z03.74
  • Encounter (with health service) (for)suspected condition, ruled outcervical shortening → Z03.75
  • Encounter (with health service) (for)suspected condition, ruled outmaternal and fetal conditions NEC → Z03.79
  • Encounter (with health service) (for)suspected exposure (to), ruled outanthrax → Z03.810
  • Encounter (with health service) (for)suspected exposure (to), ruled outbiological agents NEC → Z03.818
  • Encounter (with health service) (for)observation (for) (ruled out)condition suspected related to home physiologic monitoring device → Z03.83
  • Encounter (with health service) (for)observation (for) (ruled out)malfunction of home cardiorespiratory monitor → Z03.83
  • Encounter (with health service) (for)observation (for) (ruled out)non-specific findings home physiologic monitoring device → Z03.83
  • Observation (following) (for) (without need for further medical care)suspected, ruled outcondition NEC → Z03.89
  • Observation (following) (for) (without need for further medical care)suspected, ruled outsuicide attempt, alleged → Z03.89
  • Observation (following) (for) (without need for further medical care)suspected, ruled outsuicide attempt, allegedself-poisoning → Z03.6
  • Encounter (with health service) (for)observation (for) (ruled out)exposure to (suspected)anthrax → Z03.810
  • Observation (following) (for) (without need for further medical care)suspected, ruled outexposure (to)anthrax → Z03.810
  • Encounter (with health service) (for)observation (for) (ruled out)exposure to (suspected)biological agent NEC → Z03.818
  • Observation (following) (for) (without need for further medical care)suspected, ruled outexposure (to)biological agent NEC → Z03.818
  • Observation (following) (for) (without need for further medical care)suspected, ruled outforeign bodyingested → Z03.821
  • Observation (following) (for) (without need for further medical care)suspected, ruled outforeign bodyaspirated (inhaled) → Z03.822
  • Observation (following) (for) (without need for further medical care)suspected, ruled outforeign bodyinserted (injected), in (eye) (orifice) (skin) → Z03.823

3 more, longer entries are not listed; the search box finds them by word.

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