DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

O16 Unspecified maternal hypertension

  • Header · not billable

O16 is not billable. The category heads 6 billable codes in FY2027: the 6 codes directly below it.

Index → code

  • Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)maternal → O16.-
  • Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)complicatingpregnancy → O16.-
  • Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)complicatingchildbirth (labor) → O16.4

Where it sits

  1. Chapter 15 Pregnancy, childbirth and the puerperium (O00-O9A)
  2. O10-O16 Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium (O10-O16)
  3. O16 Unspecified maternal hypertension
Billable codes
6
Subdivisions
6
CC / MCC codes
3 / 0
HCC V28 codes
0
New FY2027
0
Index entries
4

Codes in O16

  1. O16.1
    Unspecified maternal hypertension, first trimester
    BillableCC
  2. O16.2
    Unspecified maternal hypertension, second trimester
    BillableCC
  3. O16.3
    Unspecified maternal hypertension, third trimester
    BillableCC
  4. O16.4
    Unspecified maternal hypertension, complicating childbirth
    Billable
  5. O16.5
    Unspecified maternal hypertension, complicating the puerperium
    Billable
  6. O16.9
    Unspecified maternal hypertension, unspecified trimester
    Billable

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

Notes that also apply

Chapter 15 instructions (Notes 6, Excludes1 1, Excludes2 4, Use additional code 1): printed on the chapter 15 page.

Index entries

  • Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)maternal → O16.-
  • Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)complicatingpregnancy → O16.-
  • Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)complicatingchildbirth (labor) → O16.4
  • Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)complicatingpuerperium, pre-existing → O16.5

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy