A TV creator who has been behind the scenes on hit shows going back to the 1980s was diagnosed with Alzheimer’s disease. David Milch revealed the diagnosis in an interview published today by Vulture.

Milch created the acclaimed HBO Western series “Deadwood” and co-created ABC’s “NYPD Blue” with Steven Bochco. His long list of TV credits goes back to “Hill Street Blues” in the 1980s and includes “L.A. Law,” “Murder One” and “True Detective,” among other shows.

“As best I understand it, which is minimally, I have a deterioration in the organization of my brain,” Milch said in the Vulture interview. “And it’s progressive. And in some ways discouraging. In more than some ways — in every way I can think of.”

Milch recently wrote “Deadwood: The Movie,” which picks up about 10 years after the action in the original series and will bring back much of the original cast. the series ran three seasons before its cancellation in 2006.

The Vulture piece reports: “Milch started to worry that something was amiss five years ago, when he and his friends and relatives noticed more instances of ‘imperfect recall and tardy recall and short temper. I became more and more of an acquired taste,’ he says.”

Milch also noticed that the writing process became more difficult, citing “a generalized incertitude and a growing incapacity.”

The challenges prompted him to have a brain scan about a year ago that resulted in the diagnosis.

HBO said in a statement: “We treasure our relationship with David Milch, a beloved and long-standing member of the HBO family. We honor David’s privacy and stand by his side in every way as he faces this challenge.”

The “Deadwood” movie is scheduled to premiere May 31 on HBO.

Here’s a clip of Milch rhapsodizing about “Deadwood,” posted in 2016 …