Wiki Inpatient coding

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Inpatient admitted at 26 weeks for IUGR admit diagnosis coding would be O365920, Z3A26. Pt still in hospital 3 weeks later how should the coding progress would it stay the same at Z3A26 or would it change to Z3A29 and would the IUGR code stay the same at O365920 or would that change to O365930?
 
Inpatient admitted at 26 weeks for IUGR admit diagnosis coding would be O365920, Z3A26. Pt still in hospital 3 weeks later how should the coding progress would it stay the same at Z3A26 or would it change to Z3A29 and would the IUGR code stay the same at O365920 or would that change to O365930?

I'm not an OB coder, but it looks like this is addressed in the ICD-10 guidelines.

Chapter 15

4) Selection of trimester for inpatient admissions that encompass more than one trimester

In instances when a patient is admitted to a hospital for complications of pregnancy during one trimester and remains in the hospital into a subsequent trimester, the trimester character for the antepartum complication code should be assigned on the basis of the trimester when the complication developed, not the trimester of the discharge. If the condition developed prior to the current admission/encounter or represents a pre-existing condition, the trimester character for the trimester at the time of the admission/encounter should be assigned.



Chapter 21:

11) Encounters for Obstetrical and Reproductive Services

Codes in category Z3A, Weeks of gestation, may be assigned to provide additional information about the pregnancy. Category Z3A codes should not be assigned for pregnancies with abortive outcomes (categories O00- O08), elective termination of pregnancy (code Z33.2), nor for postpartum conditions, as category Z3A is not applicable to these conditions. The date of the admission should be used to determine weeks of gestation for inpatient admissions that encompass more than one gestational week.
 
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