D0170 is the CDT code for a limited, problem-focused re-evaluation of an established patient — a follow-up visit to reassess a previously identified problem that is not a routine post-operative check.
Informational only — confirm the official CDT descriptor and your payers' rules independently. This is general guidance, not billing, coding, or clinical advice.
When to Use the D0170 Code
Use D0170 when an established patient returns so the dentist can re-evaluate a specific, previously identified condition — for example, monitoring a questionable tooth, rechecking a soft-tissue lesion, or following up on a symptom to see whether it has changed. It is a focused reassessment, not a new evaluation and not a routine exam.
The descriptor specifically excludes the post-operative visit that is part of a procedure's normal global period — that follow-up is not separately billable as D0170. Don't confuse it with the limited evaluation, D0140, used for a new acute complaint, or the periodic recall exam, D0120. D0170 is for re-checking something already known, not for a brand-new problem.
Documentation & Clinical Scenarios
The record should connect the re-evaluation to the original finding:
- The prior problem being reassessed and the date it was first identified.
- The reason for re-evaluation and what changed (or didn't) since the last visit.
- Current clinical findings, the updated diagnosis or status, and the disposition.
- A note confirming this is not a post-operative follow-up within another procedure's global period.
Any radiographs or treatment performed at the re-evaluation are reported separately under their own codes. D0170 covers only the focused reassessment.
Insurance & Billing Tips
- Don't bill it as a post-op visit. A routine follow-up included in a procedure's global period is not separately payable as D0170 — this is a common denial reason.
- Tie it to the original finding. A narrative linking the re-evaluation to the previously identified problem supports the claim.
- Verify coverage. Not all plans reimburse D0170, and some bundle it into the annual evaluation allowance shared with D0120 and D0140.
- Avoid double-billing evaluations. D0170 plus another evaluation code on the same date for the same provider is usually not both payable.
- Bill diagnostics and treatment separately. Imaging and any care delivered at the visit ride on their own codes.
Example Case
Two weeks after a limited exam, a patient returns so the dentist can recheck a molar that showed early, uncertain symptoms but no clear diagnosis at the first visit. The dentist re-evaluates the tooth, compares it to the prior findings, and confirms the symptoms have resolved — no treatment needed. Because this is a focused reassessment of a previously identified problem (and not a post-operative visit), the recheck is coded D0170, with a narrative tying it to the original finding. The claim processes cleanly with that documentation.
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Frequently Asked Questions
What's the difference between D0170 and D0140?
D0140 is a limited evaluation for a new problem-focused complaint, while D0170 is a limited re-evaluation of a problem that was already identified at an earlier visit. The key distinction is whether the issue is new (D0140) or being rechecked (D0170). Documentation should make clear which applies, since billing a re-evaluation as a fresh limited exam can cause confusion or denial.
Can I bill D0170 for a post-operative check?
No. The descriptor explicitly excludes the post-operative visit. A routine follow-up that falls within a procedure's normal global period — checking healing after an extraction or surgery, for instance — is considered part of that procedure and is not separately billable as D0170. Billing it that way is a frequent denial reason, so reserve D0170 for re-evaluations unrelated to a procedure's standard follow-up.
How often will insurance cover D0170?
Coverage varies and not every plan reimburses D0170. Some payers count it against the same annual evaluation allowance shared with D0120 and D0140, and may not pay it alongside another evaluation on the same date. Verifying benefits in advance and attaching a narrative that ties the re-evaluation to the original finding gives the claim the best chance.
Does D0170 include any treatment or X-rays?
No. D0170 covers only the focused re-evaluation. If the dentist takes a radiograph to compare against prior imaging, or performs any treatment at the visit, those services are reported separately under their own codes. The re-evaluation narrative may reference them, but each is billed on its own line at the appropriate code.
Confirm the current CDT descriptor and your specific payer policies before billing — browse the full dental code library or see our insurance verification feature.