By MATTHEW HOLT
I have been on a quest to try to understand why I am being charged $34.95 by Labcorp for some lab tests that I think should be free under the ACA preventative care statutes, and for which my insurer Blue Shield of Californian has issued me an EOB with a $0 co-pay.
It’s been a microcosm of the chaos of American health care so far, If you want to catch up here’s part 1, part 2, part 3 and part 4
You may recall that I had paid a $50 co pay for the lab tests connected to my preventative annual wellness visit in 2024 (and I didn’t pay attention) but that when I got a $34.94 charge from Labcorp in 2025 and found that Blue Shield said my copay was $0, I decided to investigate.
I have had a lot of help from Rhea, a senior customer service rep at Labcorp who I think is having nearly as much fun with this as I am. She told me that the co-pay Labcorp tries to collect is the lower of $50 or whatever the total bill is. For the 5 tests I had, Labcorp’s agreed rate with Brown and Toland Physicians (the Blue Shield-owned IPA that contracts with their HMO, of which I am a member) was $34.94. So that is the answer as to that charge.
But it still doesnt answer a couple more questions.
- Why was a subsequent lab test I had as a follow up also shown by Blue Shield as a $0 copay on the EOB?
- Why weren’t the lab tests I had considered preventative under the ACA and therefore also free?
Rhea’s guess for the first answer is that Labcorp receives a capitated amount for lab tests from Blue Shield or Brown and Toland, and that the second test was somehow covered under that. Maybe, but then why wasn’t the first one?
The second question takes me further down a rabbit hole. Rhea dug out the order from One Medical to Labcorp. You can see below that the CPT codes are on it (what the tests actually are) and also what the related diagnosis codes are.
I of course asked chatGPT what those diagnosis codes were and the answer is
E78.5 = Hyperlipidemia (i.e. high cholesterol)
R73.03 = PreDiabetes
E66.811 = Obesity class 1
M10.9 = Gout
As you might suspect as a pretty typical 60+ year old American, I fit the bill for all those diagnoses. The CPT codes for the tests I had are complete blood count, Metabolic Panel, Hemoglobin (A1C), Lipid Panel, and Uric Acid (which causes gout).
Presumably all of those, with the possible exception of the Gout/Uric Acid, could be seen to be preventative. After all the CMS web site explains that preventative screening is free for “Annual Wellness Visits and Physical Exams, for instance with a primary care doctor and Health Screeningsfor blood pressure, cholesterol, blood sugar for diabetes, and various cancer screenings such as colonoscopies and mammograms”.
So why is this not free to me? Rhea from Labcorp suggests that Blue Shield initially issued me a $0 copay EOB but later should have reprocessed that when it got the bill from Labcorp, and told me to pay the $39.94. She also found that in addition to CMS suggesting what should be called preventative, Blue Shield of CA has a very long document with what it thinks is preventative care. You can see and download it here.
I asked ChatGPT to read it for me and after a bit of looking around we (that’s me and ChatGPT) concluded that E78.5 is in the list of applicable ICD-10 diagnoses codes for Annual health appraisal visits, which are a (free) covered service. So my high cholesterol should be screened for free.
On the other hand there’s a whole section on Page 28 of the document discussing pre-diabetes education but it doesn’t explicitly say that an A1C test is covered under the annual wellness visit. And if you go way down, to page 116, there’s a table that suggests that last year a Blue Shield review removed several of the diabetes codes, including R73.03.
Now I am not going to pretend that I understand what the hell is going on in this document, and why (or whether) Blue Shield is able to change what CMS says it should do–if that is what in fact is happening. But it does seem weird.
And again, because there are no actual costs per test from Labcorp (there are charges per test but they are bundled and discounted on the bill), it’s impossible to tell what the contracted cost for each test was, and therefore whether I got some for free (as I think I should have) and what I was actually charged for.
Finally, I got very excited as Blue Shield sent me a message tonight which had an attachment which I think is a response to the grievance that was somehow filed for me by someone from their executive offices in part 2. But the attachment wasn’t properly formatted. So I don’t know what it says!
No less than I’d expect on this adventure.
But hopefully we are close to finding out who is charging whom for what and why!
UPDATE. I called Blue Shield’s grievance line and a nice customer service rep read me the letter that I couldn’t see online. Essentially Blue Shield has asked Brown and Toland to explain what happened. That grievance will take another 30 days! The rep wasn’t able to send it to me in my portal, but she could send me an email (It will be one of those secured ones that are super annoying to open). She told me it was sent while she was on the phone but 30 mins later, it’s not here!
Matthew Holt is the founder and publisher of THCB
