update: several have chimed in on twitter and elsewhere that the episode on January 10 had slightly higher viewers (21.03 million) and indeed that's what we show, too and what was originally reported.
However, the "final" numbers that come out the next afternoon are not absolutely final, and further adjustments were made to episode #199 that took it down 10,000 viewers from 21.03 million to 20.93 million (final, final number!) so last night's 20.98 million, barring any further adjustments, does stand as the season high.
via press release:
THE 200TH EPISODE OF "NCIS" DELIVERS SEASON-HIGH 20.98 MILLION VIEWERS
"NCIS" is #1 Program on Tuesday in Viewers and Key Demographics
"NCIS: Los Angeles" Wins Time Period in Viewers and Demos
Time Period-Winning "Unforgettable" Posts Gains From Last First-Run Episode
CBS Wins Night in Viewers, Adults 18-49 and Adults 25-54
The 200th episode of NCIS delivered a season-high 20.98 million viewers and ranked as Tuesday's #1 program in both viewers and key demographics, according to Nielsen live plus same day ratings for Feb. 7.
NCIS's 200th episode was first in households (12.8/20), viewers (20.98m), adults 25-54 (6.1/14) and adults 18-49 (4.2/11). Compared to the last first-run episode (on Jan. 10, 2012), NCIS was up +2% each in households (from 12.6/19), adults 25-54 (from 6.0/14) and adults 18-49 (from 4.1/11) while adding +50,000 viewers (from 20.93m). NCIS posted season-high deliveries in households, viewers and adults 25-54, matched the season's second-best adults 18-49 ratings. NCIS was the night's #1 program in these measures.
NCIS: LOS ANGELES was first in households (10.0/15), viewers (16.27m), adults 25-54 (4.6/10) and adults 18-49 (3.1/08) at 9:00 PM.
UNFORGETTABLE was first in households (7.7/13), viewers (11.86m), adults 25-54 (3.4/08) and second in adults 18-49 (2.2/06, -0.1 behind ABC). Compared to the last first-run episode (on Jan. 10, 2012), UNFORGETTABLE was up +7% in households (from 7.2/12), +13% in adults 25-54 (from 3.0/07), even in adults 18-49 and added +610,000 viewers (from 11.25m, +5%).
For the night, CBS was first in households (10.2/16), viewers (16.37m), adults 25-54 (4.7/11) and adults 18-49 (3.2/08).