What should the D4355 chart note include?
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Full mouth debridement to enable comprehensive oral evaluation. RMH: Medical history reviewed/updates BP: BP/Pulse Indication: Indication/diagnosis Heavy plaque and calculus preventing comprehensive evaluation. Unable to complete periodontal charting. FMD code support: Excessive calculus/debris prevents comprehensive periodontal diagnosis Photo support: Intraoral photos demonstrating calculus/debris Definitive evaluation plan: Comprehensive evaluation/periodontal diagnosis after debridement Procedure: Gross debridement performed. Ultrasonic scaling. Hand scaling. Supragingival and subgingival deposits removed. All quadrants treated. Comprehensive evaluation to be completed at next visit. Full periodontal charting at next visit. OHI: Instructions reviewed. Complications: None or describe. Patient tolerance: Tolerance/response. NV: Next visit
What documentation is required for D4355?
Because D4355 is defined by the impossibility of evaluation, the chart has to prove that impossibility — not just that scaling was performed. A defensible D4355 note includes:
- Medical history review and update — meds, conditions, allergies, ASA status, last physical. Many D4355 patients are also overdue for medical care; document what was reviewed.
- Vitals — BP and pulse. Required by many state boards; standard on any patient who has not been seen in years.
- Time since last dental visit / dental history — explicit. "Patient reports last cleaning 8 years ago" or "no prior dental records available" is a key audit anchor. The longer the absence, the more defensible the code.
- Chief complaint and reason for visit — usually "wants a cleaning," "gums bleed," "haven't been to the dentist in years," or a specific complaint that drove the visit.
- Why a comprehensive evaluation could not be performed today — the single most important sentence in the note. Examples: "Heavy generalized supra- and subgingival calculus prevents accurate probing and radiographic interpretation; comprehensive periodontal evaluation deferred." This sentence is what separates D4355 from D1110 / D4346 / SRP.
- Periodontal screening attempted, with explanation of why it could not be completed — note any spot-check probings, BOP observed, mobility noticed, but explicitly state that full 6-point charting was not possible because of the deposits. Auditors expect to see that you tried.
- Plaque, calculus, and debris distribution and severity — generalized vs localized; heavy supragingival; subgingival deposits palpable on the explorer; tenacious calculus bridges; staining. Patient-specific findings, not boilerplate.
- Intraoral photos — strongly recommended. Pre-debridement photos demonstrating the volume of deposits are the single most effective audit defense for D4355. Many carriers (and several Medicaid MCOs) request photos on review; offices that routinely capture them have the lowest D4355 recoupment rates.
- Radiographs taken or attempted — note imaging exposed today and any limitations. If radiographs could not be diagnostically interpreted because of calculus, document that. Imaging is billed under its own codes (D0210 / D0220 / D0274 etc.) and is not bundled into D4355.
- Procedure performed — gross debridement, ultrasonic scaling, hand scaling, full mouth, supra- and subgingival deposits removed; quadrants treated; approximate time. Some carriers ask for procedure time on appeal.
- Anesthesia / topical — if used, note product and amount; many D4355 visits use topical or nothing because anesthesia for SRP would be premature without a diagnosis.
- Plan for the subsequent comprehensive evaluation — explicit: "Patient to return in 4–6 weeks for D0150 + D0180 with full periodontal charting and definitive treatment plan." This sentence is what makes the code "to enable a comprehensive periodontal evaluation."
- Oral hygiene instruction — patient-specific home-care expectations during the 4–6 week interval; this is when patient-driven plaque control matters most.
- Complications — explicitly noted, even if "none."
- Patient tolerance / response.
- Next visit — date and what's planned (D0150 / D0180 + perio charting + radiographs as needed; possible D1110 / D4346 / SRP based on the diagnosis to come).
The "amnesia test" applies forcefully here: a third-party reader must be able to tell why you couldn't evaluate today and what the next visit will accomplish. Default-normal templating ("heavy calculus generalized" copy-pasted across every D4355 in the practice) is a known Medicaid OIG audit pattern.
Why does D4355 get denied?
The most common reasons D4355 is denied, downgraded, or recouped:
- Same-day D0150 / D0180 / D0120 — the descriptor explicitly defers the eval to a subsequent visit; the carrier denies one of the two as bundled. The ADA's bundling guidance and carrier processing policies are aligned on this point.
- Same-day D1110 / D4346 / D4341 / D4342 — D4355 conflicts with every other scaling-family code on the same DOS. Submitting both produces a denial of one (almost always the higher-fee one).
- Insufficient documentation that an eval could not be performed — the chart says "heavy calculus" but doesn't explicitly state that comprehensive periodontal evaluation could not be performed today. Carriers downgrade to D1110 when the rationale is implicit instead of explicit.
- No photos — many carriers and most state Medicaid MCOs request pre-debridement photos on review. Their absence is a routine downgrade trigger.
- Patient is established / has prior perio chart on file — the "evaluation cannot be performed" rationale doesn't fit a patient whose periodontal status is already documented in the practice's records. Auditors flag this pattern.
- Frequency violation — prior D4355 on file — once-per-lifetime-per-provider (and sometimes per-practice) limits are enforced strictly. The patient may have had a D4355 at a previous office that the front desk cannot see in the chart but the carrier can see in claim history.
- Billed instead of D1110 for routine cleanings — the most-flagged audit pattern in the family. D4355 ratios above peer norms attract Medicaid OIG and commercial special-investigations attention.
- No subsequent comprehensive eval ever scheduled or performed — when D4355 is followed by D1110 or SRP without an intervening D0150 / D0180, carriers treat the D4355 as a misreported prophy because the descriptor's stated purpose was never fulfilled.
- D4355 shortly after a recent D1110 or D4346 — Delta Dental and several other carriers deny D4355 when claim history shows a prophy or D4346 within the prior 12 months, on the theory that those codes already addressed what D4355 would have.
- Default-normal templating — every D4355 chart in the practice reads identically with the same calculus distribution and the same "patient hasn't been to the dentist in years" line. State Medicaid OIG audits routinely cite this.
- Billed on the same patient who returns 6 weeks later for SRP without an intervening eval — D4355 then SRP without a D0150 / D0180 in between collapses the clinical sequence the descriptor demands.
What do practices ask about D4355?
Can I bill D4355 and D0150 (or D0180) on the same day?+
No. The ADA descriptor explicitly defers the comprehensive evaluation to a subsequent visit, and every major carrier processes D4355 + D0150 (or D4355 + D0180 / D0120) as conflicting on the same DOS. The expected sequence is D4355 today, D0150 / D0180 with full periodontal charting 4 to 6 weeks later, and definitive therapy (D1110, D4346, or SRP) after that. Submitting both on the same date results in one being denied or bundled — almost always D4355.
How often can I bill D4355?+
Most PPO carriers cover D4355 once per lifetime per provider; many tighten this to once per lifetime per practice tax-ID, and some Medicaid MCOs require pre-authorization. A small number of plans allow it once every 2–3 years, but those are exceptions. Once a D4355 has been paid for a patient, the carrier will not pay another regardless of how long the patient has been away. Verify the patient's claim history with the carrier before submitting; a prior D4355 from a previous office is invisible to the practice but visible to the payer.
What's the difference between D4355 and D1110?+
D1110 is preventive — appropriate when the patient's periodontal status is known (or knowable today) and the cleaning addresses today's deposits. D4355 is gating — it exists because the calculus volume itself prevents comprehensive periodontal evaluation, full 6-point charting, and accurate radiographic interpretation. The clinical test is whether you could complete the evaluation today; if yes, it isn't D4355. The most common D4355 misuse is reaching for it on a heavy-calculus patient who could otherwise have been evaluated and cleaned in the same visit.
Can D4355 be a routine precursor to SRP?+
No. The ADA has explicitly cautioned against using D4355 as a routine pre-SRP visit. SRP (D4341 / D4342) is therapeutic and presumes a diagnosis; D4355 predates diagnosis. The correct sequence on a periodontitis patient where the diagnosis is feasible at the first visit is to skip D4355 entirely and proceed to comprehensive perio evaluation followed by SRP at the appropriate visit. Use D4355 only when the deposits genuinely prevent diagnosis at the first visit. Carriers flag practices with D4355 followed by SRP on most or all new perio patients.
Do I need photos to support D4355?+
Photos are not strictly required by the ADA descriptor, but they are the single most effective audit defense. Many commercial carriers and most state Medicaid MCOs request pre-debridement intraoral photos on review, and offices that routinely capture them have substantially lower D4355 recoupment rates. At minimum, capture full-face retracted, maxillary and mandibular anteriors, both buccals, and the mandibular lingual (where the calculus volume is usually highest). Save the images to the chart on the date of service.
What if the patient never returns for the comprehensive evaluation after D4355?+
This is a real audit risk. The descriptor specifies that D4355 enables a comprehensive evaluation at a subsequent visit; if no D0150 / D0180 is ever performed, carriers can treat the D4355 as a misreported prophy. Document the recommended follow-up and any patient outreach (calls, letters, portal messages) when patients no-show. If a patient returns straight to D1110 or SRP without an intervening eval, expect carrier scrutiny on the D4355 claim. Practice-level patterns of D4355 with no follow-through are a top Medicaid OIG flag.
Can I bill D4355 on an established patient who has fallen out of care?+
Sometimes — but the bar is higher. The descriptor's rationale is that comprehensive periodontal evaluation cannot be performed because of the calculus volume. On an established patient with a prior perio chart on file, carriers and auditors push back: "the evaluation could be performed because you already have one." To support D4355 on an established patient, the chart should establish a long absence (typically several years), document why the prior chart is no longer reflective of current status, and explicitly state that a current evaluation cannot be performed today. Many carriers will still downgrade these claims to D1110.