Cal. Code Regs. tit. 22 § 97228
For discharges occurring on or after January 1, 2017: The patient's principal procedure is defined as one that was performed for definitive treatment (rather than one performed for diagnostic or exploratory purposes) or was necessary to take care of a complication. If there appear to be two procedures that are principal, then the one most related to the principal diagnosis should be selected as the principal procedure. Procedures shall be coded according to the ICD-10-PCS. If only non-therapeutic procedures were performed, then a non-therapeutic procedure should be reported as the principal procedure, if it was a significant procedure. A significant procedure is one that is surgical in nature, or carries a procedural risk, or carries an anesthetic risk, or is needed for MS-DRG assignment. The date the principal procedure was performed shall be reported in numeric form as follows: the 4-digit year, the 2-digit month, and the 2-digit day. The numeric form for days and months from 1 to 9 must have a zero as the first digit.
Cal. Code Regs. Tit. 22, § 97228
2. Amendment of NOTE filed 7-23-97 pursuant to section 100, title 1, California Code of Regulations (Register 97, No. 30).
3. Amendment filed 9-21-98; operative 10-21-98 (Register 98, No. 39).
4. Amendment of section heading filed 5-5-2005; operative 5-5-2005 pursuant to Government Code section 11343.4 (Register 2005, No. 18).
5. Change without regulatory effect amending section filed 8-23-2011 pursuant to section 100, title 1, California Code of Regulations (Register 2011, No. 34).
6. Amendment filed 4-3-2014; operative 7-1-2014 (Register 2014, No. 14).
7. Amendment filed 9-4-2014; operative 10-1-2014 pursuant to Government Code section 11343.4(b)(3) (Register 2014, No. 36).
8. Amendment of subsection (b) and new subsection (c) filed 10-16-2015; operative 1-1-2016 (Register 2015, No. 42).
9. Change without regulatory effect repealing subsection (a) and relettering subsections filed 7-20-2016 pursuant to section 100, title 1, California Code of Regulations (Register 2016, No. 30).
10. Change without regulatory effect repealing subsection (a) and subsection (b) designator filed 10-31-2018 pursuant to section 100, title 1, California Code of Regulations (Register 2018, No. 44).
Note: Authority cited: Section 128810, Health and Safety Code. Reference: Section 128735, Health and Safety Code.
2. Amendment of Note filed 7-23-97 pursuant to section 100, title 1, California Code of Regulations (Register 97, No. 30).
3. Amendment filed 9-21-98; operative 10-21-98 (Register 98, No. 39).
4. Amendment of section heading filed 5-5-2005; operative 5-5-2005 pursuant to Government Code section 11343.4 (Register 2005, No. 18).
5. Change without regulatory effect amending section filed 8-23-2011 pursuant to section 100, title 1, California Code of Regulations (Register 2011, No. 34).
6. Amendment filed 4-3-2014; operative 7-1-2014 (Register 2014, No. 14).
7. Amendment filed 9-4-2014; operative 10/1/2014 pursuant to Government Code section 11343.4(b)(3) (Register 2014, No. 36).
8. Amendment of subsection (b) and new subsection (c) filed 10-16-2015; operative 1/1/2016 (Register 2015, No. 42).
9. Change without regulatory effect repealing subsection (a) and relettering subsections filed 7-20-2016 pursuant to section 100, title 1, California Code of Regulations (Register 2016, No. 30).
10. Change without regulatory effect repealing subsection (a) and subsection (b) designator filed 10-31-2018 pursuant to section 100, title 1, California Code of Regulations (Register 2018, No. 44).