A chiropractor version of the lightbulb joke is:
     
Q: How many chiropractors does it take to change a lightbulb?
A: Just one, but it takes twelve visits.
   
“How many chiropractors does it take to change a light bulb? One, but it takes 20 visits” was printed in the Dawson Springs (KY) Progress on January 12, 1989. “How many chiropractors does it take to screw in a light bulb? Only one, but it takes nine visits” was posted on the newsgroup rec.humor on March 22, 1990. “How many chiropractors does it take to change a lightbulb? Just one, but it takes twelve visits” was posted on Twitter by sickipedia on October 14, 2014.
   
       
Newspapers.com
12 January 1989, Dawson Springs (KY) Progress, “About Town,”  pg. B12, col. 6: 
How many chiropractors does it take to change a light bulb? One, but it takes 20 visits.
         
Google Groups: rec.humor
Lightbulb jokes -summary (LONG)
Ronald van Loon
Mar 22, 1990, 4:16:14 AM
(...)
How many chiropractors does it take to screw in a light bulb?
Only one, but it takes nine visits.
 
Google Groups: rec.humor.d
Light Bulb Jokes
James V. Tedeschi
Aug 28, 1990, 9:08:41 AM
(...)
How many chiropractors does it take to screw in a light bulb?
Only one, but it takes nine visits.
 
Newspapers.com
6 November 1990, Tallahassee (FL) Democrat, “Chiropractors deserve respect as trained physicians” by Peri Dwyer, pg. &a, col. 4:
“Q: How many chiropractors does it take to change a light bulb?” A: One…but the bulb has to come back for several appointments.”
 
Newspapers.com
8 December 1990, Miami (FL) Herald, “Joking Around,” pg. 8BR, col. 2:
How many chiropractors does it take to change a light bulb? Just one. But it takes 32 visits.
     
Google Groups: rec.humor
Dawgs and Communications
Avatar
Jan 9, 1991, 9:50:03 PM
(...)
Q: How many chiropractors does it take to change a lightbulb?
A: Just one, but it takes THIRTY FIVE visits for him to get it just right!
   
Google Books
Adjustments:
The Making of a Chiropractor
By Vincent T. Joseph and Terry Cox-Joseph
Norfolk, CA: Hampton Roads Publishing Company
1993
Pg. 38:
“How many chiropractors does it take to change a light bulb?” he chortled. “One, but he’ll have to go back for ten adjustments!”
 
Google Groups: bit.listserv.skeptic
lightbulb joke
Mark Meyer
Dec 13, 1994, 12:11:51 PM
(...)     
From: .(JavaScript must be enabled to view this email address) (W. Syvinski)
Q: How many chiropractors does it take to chenge a lightbulb?
A: Only one, but it takes nine visits.
   
Twitter
Jeff McGrath
@youtah
Q: How many chiropractors does it take to change a lightbulb ? A: Just one, but it takes nine visits.
12:56 AM · Feb 7, 2009
       
Twitter 
Jerimy Bruce
@brucechiro
How many Chiropractors does it take to replace a light bulb.  Only one, but he will need preapproval from the insurance company first.
2:25 PM · Mar 6, 2009
 
Twitter
Nursing Jocularity
@FunnyNurse
How many chiropractors does it take to change a light bulb? Only 1, but it takes 9 visits. (what’s your answer?)
2:04 AM · Mar 27, 2009
   
Twitter
Suburban Physician
@BurbDoc
How many chiropractors does it take to change a light bulb? Just one, but it requires 43 visits and 2 full body xrays first.
12:00 AM · Aug 14, 2010
   
Twitter
Sunburst ❇1️⃣✳2️⃣❇
@Emity
How many chiropractors does it take to change a lightbulb?  Just one, but it’ll take 24 weekly appointments.
12:53 AM · Sep 2, 2011
   
Twitter
sickipedia
@sickipediareal
How many chiropractors does it take to change a lightbulb?
Just one, but it takes twelve visits.
6:31 PM · Oct 14, 2014
 
Reddit—Jokes
Posted by u/count_dressula May 25, 2015
How many chiropractors does it take to change a light bulb?
Just one. But it takes about 8-10 visits.
   
Reddit—Jokes
Posted by u/JustinFaulkinTrudeau June 5, 2016
How many Chiropractors does it take to screw in a lightbulb?
One, but they’ll take 30 visits to do it.
   
Reddit—Jokes
Posted by u/buthidae June 24, 2017
How many Chiropractors does it take to change a lightbulb?
Just the one, but it’ll take three visits a week for the first few weeks, once a week for a month, then once a month for as long as you choose.
 
Reddit—Jokesuncensored
Posted by u/madazzahatter October 15, 2017
How many chiropractors does it take to change a lightbulb?
Just one, but it takes twelve visits.
   
Reddit—Jokes
Posted by u/[deleted]5 years ago August 13, 2018
How many chiropractors does it take to screw in a lightbulb?
Just one, but needs 5 sessions.
   
Reddit—Jokes
Posted by u/keithasaurus October 19, 2018
How many chiropractors does it take to change a light bulb?
Just one. But it takes about 8-10 visits.
 
Twitter
Bob Kostic
@causticbob
How many chiropractors does it take to change a lightbulb?
Just one, but it takes twelve visits.
7:59 PM · Oct 15, 2020
 
Reddit—Jokes
Posted by u/extrafarts44 May 4, 2023
How many chiropractors does it take to change a light bulb?
Only one, but it takes six visits.
COMMENTS
RandomName39483
My chiropractor is very expensive. He charges $75 a pop.