D4277 is the CDT code for a free soft tissue graft, better known as a free gingival graft, where an epithelialized piece of the patient's own tissue is placed on the surface of the gum at the first tooth, implant, or edentulous position, with both the donor and recipient sites included in the fee.
Free gingival grafts are usually done to widen the band of attached keratinized tissue, and that purpose is exactly what carriers probe. A reviewer wants the keratinized-tissue measurement that justifies the graft, and a claim built on root-coverage language invites a question about why the subepithelial technique was not used instead. The code runs per position, with D4278 picking up each additional contiguous tooth, implant, or edentulous position in the same graft site.
What D4277 covers
D4277 reports a free soft tissue graft, the procedure most offices call a free gingival graft, at the first tooth, implant, or edentulous tooth position treated. The surgeon harvests an epithelialized piece of tissue, almost always from the palate, and sutures it directly onto a prepared bed on the gum surface. Both the donor site and the recipient site are inside the one fee.
The classic indication is a thin or absent band of attached keratinized tissue: around a natural tooth with progressing recession, around an implant, or at a site where a frenum pull or shallow vestibule keeps destabilizing the margin. Free grafts can also deepen a vestibule or eliminate a frenum pull, and published carrier policies acknowledge those uses. Root coverage is possible with a free graft, but it is the connective tissue technique’s home turf, and that difference matters on the claim.
D4277 versus D4273: surface graft versus tunnel graft
Both codes are autogenous, both include the donor site, and both usually harvest from the palate, so the donor-source check that separates D4273 from D4275 does nothing here. The separating axis is the tissue layer and placement:
- D4277 takes the tissue with its epithelium and places it on the surface. Typical goal: more attached keratinized tissue.
- D4273 takes subepithelial connective tissue and tucks it under a flap. Typical goal: root coverage.
Read the operative note for “epithelialized,” “sutured to the periosteal bed,” or “recipient bed prepared” versus “tunnel,” “envelope,” or “under the flap.” Coding a subepithelial technique as D4277, or the reverse, survives a code-number check and fails a records review.
Counting positions: D4277 first, D4278 each additional
The unit is the tooth, implant, or edentulous tooth position within the graft, not the quadrant and not the graft as a whole.
- First position: D4277.
- Each additional contiguous position in the same graft site: D4278.
- A second, separate graft site elsewhere in the mouth: a new D4277.
A free graft spanning #24 and #25 is D4277 plus one D4278. Two independent grafts at #6 and #28 are two D4277 lines. Edentulous positions count: a graft that runs from a tooth across an adjacent edentulous ridge position picks up a D4278 for that position.
Coverage and common denials
- No keratinized-tissue measurement. The width of attached gingiva is the number this specific procedure lives on. A published Anthem mucogingival policy asks for pretreatment charting within 12 months with millimeters of attached gingiva and recession, and generally reviews recession-driven cases against a 2 mm recession with 1 mm or less attached gingiva benchmark absent other findings. Numbers vary by plan; the need for numbers does not.
- Adequate-tissue pushback. The same policy notes the literature finding that with good plaque control, no minimum keratinized width is required to keep tissue healthy, so a graft with pristine hygiene and no inflammation, recession, or restorative driver can be judged unnecessary. The narrative should say why this site is failing rather than only noting that the band is narrow.
- Cosmetic exclusion. Grafting solely for appearance is excluded on many plans. Function first in the narrative.
- Frequency at the site. One periodontal surgical procedure per site per 36- or 60-month window is a common contract structure. Verify site history before a regraft.
- Same-day frenectomy bundled. Plans may treat a frenectomy (D7961 buccal/labial, D7962 lingual) as inclusive when done in the same area on the same date as the graft, relevant here because frenum pull is a classic free-graft indication. Plan-dependent, so check before promising the patient two paid lines.
- Wrong technique coded. A tunnel/envelope connective tissue graft billed as D4277, caught when the reviewer reads the note. Reprocessed, delayed, or denied.
Documentation that supports the claim
- Attached/keratinized gingiva width and recession in millimeters at each grafted position, dated within the plan’s charting window.
- The functional driver: progressive recession documented over time, frenum pull, vestibular depth, root sensitivity, or tissue instability around an implant or planned restoration.
- The operative note naming the graft as epithelialized and free, with the donor site described, the technique evidence for D4277 over D4273.
- The position list: which teeth, implants, or edentulous positions, and which were contiguous, so the D4277/D4278 lines reconcile against the note.
- Photos of the recipient area when available.
What to get right in your PMS
- Pair D4277 with D4278, not D4283. The add-ons are family-specific: D4278 belongs to the free graft, D4283 to the autogenous connective tissue graft, D4285 to the non-autogenous one. A crossed pair asserts a procedure that did not happen.
- Count by position, not by quadrant. The graft codes do not follow the quadrant logic of the osseous and flap families.
- Keep the donor site inside the fee. No separate harvest line, ever.
- Capture the keratinized-width measurement at exam, because it is the coverage test, and attach it to the pre-authorization rather than waiting for a records request.
FAQs
- What is the dental code for a free gingival graft?
- D4277 for the first tooth, implant, or edentulous tooth position in the graft, and D4278 for each additional contiguous position in the same graft site. The fee for D4277 includes both the recipient site and the palatal donor site, so the harvest is not a separate line. If the graft was a subepithelial connective tissue graft tucked under a flap rather than an epithelialized piece placed on the surface, the code is D4273 instead.
- How do I choose between D4277 and D4273?
- The graft layer and where it sits. D4277 is a free gingival graft: an epithelialized piece of tissue, surface layer included, sutured onto the prepared recipient bed, most often to widen attached keratinized tissue. D4273 is a subepithelial connective tissue graft: a deeper layer without the surface epithelium, tucked under a flap, and the usual choice for covering an exposed root. Both are autogenous, so the donor-source check does not separate them. The operative technique does.
- Is the palate donor site billed separately with D4277?
- No. The code includes both surgical sites, recipient and donor, in one fee. Adding a separate line for the palatal harvest is an unbundling error. The same donor-inclusive structure applies to its add-on D4278 and to the autogenous connective tissue codes D4273 and D4283.
- How do I bill a free gingival graft covering two teeth?
- D4277 for the first position and one D4278 for the second, as long as the positions are contiguous and in the same graft site. Positions count teeth, implants, and edentulous tooth positions alike. Two separate, non-contiguous graft sites are two D4277 lines, not a D4277 plus D4278.
- Why did the carrier deny D4277 as not necessary?
- Most often the mucogingival measurements did not make the case. Plans that publish criteria want the width of attached or keratinized gingiva, recession in millimeters, and a functional reason such as progressive recession, frenum pull, or an inadequate tissue band around a tooth or implant. At least one published policy also notes that where oral hygiene is good and there is no inflammation, a minimal band of keratinized tissue may be considered adequate, which is why a bare 'thin tissue' narrative without numbers loses. Criteria are plan-dependent; a pre-authorization is the reliable way to test them.
Related codes
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CDT codes are maintained by the American Dental Association. This page is an editorial billing guide, not the official ADA code descriptor. Verify current coverage policies with each carrier before submitting claims.