SimplePractice Claim Missing a Diagnosis? How to Fix It
By George Ruan • October 7, 2026
Last reviewed: October 7, 2026.
A SimplePractice claim picks up the diagnosis in effect on the date of service. If the client has no diagnosis yet, or the diagnosis is dated after the visit, the claim can’t be completed for that date. The clinician adds or dates the diagnosis correctly, and then the claim can be created; a claim that already went out needs a corrected claim.
Sections
Why the diagnosis isn’t on the claim
In the claims we hold for a diagnosis problem, the cause is nearly always one of these:
No diagnosis was ever entered. Common after a run of intakes: several new clients are seen before anyone adds a diagnosis, and all of their claims stall at once.
The diagnosis is dated after the visit. SimplePractice’s diagnosis and treatment-plan guide says a new plan defaults to the current date and time and applies to later appointments. Earlier sessions keep whatever was in effect before, which may be nothing. (If the client has only one diagnosis on file, it applies to all appointments.)
The code is not specific enough. We see claims held when a diagnosis is not coded to its full length. The fix is the complete code, chosen by the clinician.
An additional diagnosis was expected. Secondary codes appear only if multiple diagnoses are turned on in the claim settings.
Fix it, in this order
Have the treating clinician confirm the diagnosis for that visit. Billing staff should not pick a code to clear a warning.
In the client’s Overview, open the diagnosis and treatment plan and check its date and time against the visit. A diagnosis established at intake should carry the intake date, so later sessions inherit it. Don’t date it earlier than the clinician actually made it.
For a missing secondary code, follow the multiple-diagnosis guide: Settings > Client billing and insurance > Insurance billing, then turn on Include multiple Diagnosis Codes under Claims and superbill settings.
Check the claim itself. The guide notes that new diagnoses do not update claims or superbills that already exist. Recreate an unsent claim and look at its preview before submitting.
While you are in the chart, check for other blockers on the same claim. A claim held for a diagnosis is often also missing an insurance member ID.
If the claim was already submitted
Don’t delete it and send a new original. When a diagnosis is fixed after submission, the payer needs a corrected claim that references the original. That is what we send after a clinician tells us they updated a code on a visit that already went out.
Tell your biller which visit you fixed
A short message saying “diagnosis added” leaves the biller guessing. The useful version names the client (by your usual internal identifier, not in unsecured email), the dates of service, and whether you added a missing diagnosis, changed its date, or corrected a code. That tells them whether the claim can simply go out now or needs a correction filed.
For practices Bomi bills for, claims waiting on a diagnosis go out automatically once it is in place, and we file the corrected claim when a fix lands after submission. A diagnosis does not fix every blocker, though: a visit before a clinician’s in-network effective date still is not billable in-network.
A diagnosis code describes the condition; the service code describes what was provided. For the service side, see our mental health CPT code guide.
Related Guides
Frequently Asked Questions
Why is the diagnosis in the chart but not on the claim?
Usually its date is after the session, so it only applies to later appointments, or the claim was created before the diagnosis was added. Check the diagnosis date, then recreate the unsent claim.
Can I just backdate the diagnosis?
Only to the date the clinician actually established it, such as the intake session. Do not date it earlier than that to make a claim go through.
Do I need to resubmit after fixing the diagnosis?
If the claim was never sent, create or recreate it. If it was already submitted, file a corrected claim rather than a new original.
Sources
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Founded by George Ruan, Dax Earl, and Andrey Goder, Bomi helps independent therapists and group practices with insurance billing, credentialing, and payer follow-up. Bomi grew out of Dax’s experience helping his mother with her therapy practice, with a clear purpose: reduce the administrative burden of insurance while keeping practice owners in control.
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