NYPD Deputy Commissioner John Miller is in serious condition at a New York City hospital with coronavirus symptoms, The Post has learned.

The department’s head of counter-terrorism was at Lenox Hill Hospital Thursday awaiting tests for the pandemic COVID-19, according to two high-ranking police sources.

If his tests come back positive, which sources say is more than almost certain, Miller would be the third member of the NYPD’s executive team to have the bug.

Deputy Commissioner for Employee Relations Robert L. Ganley and NYPD Transit Bureau Chief Edward Delatorre tested positive last week.

The news comes as cops calling in sick soared to more than 3,700 and more than 350 members of the NYPD were confirmed to have the virus.