Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| No. in series | No. in season | Title | Directed by | Written by | Original air date | Production code | U.S. viewers (millions) |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 92.0 | 1.0 | "Tragedy" | David Platt | Amanda Green | September 23, 2003 | E4403 | 13.23 |
| 93.0 | 2.0 | "Manic" | Guy Norman Bee | Patrick Harbinson | September 30, 2003 | E4401 | 11.50 |
| 94.0 | 3.0 | "Mother" | Ted Kotcheff | Lisa Marie Petersen & Dawn DeNoon | October 7, 2003 | E4404 | 9.90 |
| 95.0 | 4.0 | "Loss" | Constantine Makris | Michele Fazekas & Tara Butters | October 14, 2003 | E4402 | 12.65 |
| 96.0 | 5.0 | "Serendipity" | Constantine Makris | Lisa Marie Petersen & Dawn DeNoon | October 21, 2003 | E4408 | 11.80 |
| 97.0 | 6.0 | "Coerced" | Jean de Segonzac | Jonathan Greene | October 28, 2003 | E4409 | 12.10 |
| 98.0 | 7.0 | "Choice" | David Platt | Patrick Harbinson | November 4, 2003 | E4411 | 13.20 |
| 99.0 | 8.0 | "Abomination" | Alex Zakrzewski | Michele Fazekas & Tara Butters | November 11, 2003 | E4410 | 12.99 |
| 100.0 | 9.0 | "Control" | Ted Kotcheff | Teleplay: Neal Baer Story: Dick Wolf | November 18, 2003 | E4413 | 13.94 |
| 101.0 | 10.0 | "Shaken" | Constantine Makris | Amanda Green | November 25, 2003 | E4414 | 13.14 |
| 102.0 | 11.0 | "Escape" | Jean de Segonzac | Barbie Kligman | December 2, 2003 | E4415 | 13.65 |
| 103.0 | 12.0 | "Brotherhood" | Jean de Segonzac | José Molina | January 6, 2004 | E4412 | 15.40 |
| 104.0 | 13.0 | "Hate" | David Platt | Robert Nathan | January 13, 2004 | E4416 | 14.00 |
| 105.0 | 14.0 | "Ritual" | Ed Bianchi | Ruth Fletcher & Christos N. Gage | February 3, 2004 | E4406 | 13.81 |
| 106.0 | 15.0 | "Families" | Constantine Makris | Jonathan Greene | February 10, 2004 | E4419 | 12.89 |
| 107.0 | 16.0 | "Home" | Rick Wallace | Amanda Green | February 17, 2004 | E4420 | 14.37 |
| 108.0 | 17.0 | "Mean" | Constantine Makris | Michele Fazekas & Tara Butters | February 24, 2004 | E4421 | 14.42 |
| 109.0 | 18.0 | "Careless" | Steve Shill | Patrick Harbinson | March 2, 2004 | E4422 | 12.50 |
| 110.0 | 19.0 | "Sick" | David Platt | Dawn DeNoon | March 30, 2004 | E4423 | 15.55 |
| 111.0 | 20.0 | "Lowdown" | Jud Taylor | Robert Nathan | April 6, 2004 | E4424 | 12.60 |
| 112.0 | 21.0 | "Criminal" | Alex Zakrzewski | José Molina | April 20, 2004 | E4425 | 12.82 |
| 113.0 | 22.0 | "Painless" | Juan J. Campanella | Jonathan Greene | April 27, 2004 | E4426 | 12.78 |
| 114.0 | 23.0 | "Bound" | Constantine Makris | Barbie Kligman | May 4, 2004 | E4427 | 13.04 |
| 115.0 | 24.0 | "Poison" | David Platt | Michele Fazekas & Tara Butters | May 11, 2004 | E4428 | 12.28 |
Question:
What episode number had production code e4423?
Answer:
19.0