VA's own inspector general found that 2,855 of 3,816 rating specialists — nearly 75 percent — had to retrain on the 2021 musculoskeletal rating updates because they did not score 80 percent on the initial assessment (VA OIG Report 23-00153-41, February 21, 2024). Those updates rewrote how a knee replacement is rated. Veterans searching online in 2026 still find the old rule repeated everywhere: one year at 100 percent. That rule ended on February 7, 2021. The current rule is four months. A veteran who does not know which rule applies cannot tell whether a rating decision is correct. This guide lays out what Diagnostic Code 5055 actually says, and how to check a decision line by line.
Key Takeaways
- Confirm which rule applies: four months at 100 percent for implantations on or after February 7, 2021, and one year for earlier surgeries.
- Add the separate one-month total rating under 38 CFR 4.30 — the 100 percent period begins after it, for five months in total.
- Expect a 30 percent minimum evaluation once the 100 percent period ends, but only for a total knee replacement.
- Check whether the 60 percent tier applies, which requires chronic residuals of severe painful motion or weakness.
- Verify that a resurfacing procedure was evaluated under Diagnostic Codes 5256 through 5262, where no minimum evaluation exists.
- Ask whether special monthly compensation was considered — VA missed it in an estimated 18 percent of these claims.
Table of Contents
- Who Qualifies for the 100 Percent Rating Under Diagnostic Code 5055
- The Evidence That Sets the Convalescence Clock
- Choosing the Right Rating Path When the 100 Percent Period Ends
- Five Steps to Audit a Knee Replacement Rating Decision
- After Convalescence: Reexamination, SMC, and Appeal Lanes
- Frequently Asked Questions
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Who Qualifies for the 100 Percent Rating Under Diagnostic Code 5055
The pain point is common and expensive: a veteran has knee surgery, hears that VA pays 100 percent afterward, and assumes the rule covers whatever the surgeon did. It does not. Diagnostic Code 5055 is titled “Knee, resurfacing or replacement (prosthesis),” and it reaches only two procedures.
The regulation grants 100 percent “for 4 months following implantation of prosthesis or resurfacing.” Note (3) to the prosthetic implants table defines the boundary: the term “prosthetic replacement” in Diagnostic Codes 5051–5053 and 5055–5056 means a total replacement of the named joint. A unicompartmental or partial knee replacement is not a total replacement, and neither is arthroscopy, a meniscus repair, or hardware removal. Those surgeries may still support a temporary total rating under 38 CFR 4.30 for convalescence, but they do not trigger the four-month period under DC 5055.
Two further notes decide close cases. Note (1) bars an additional rating under 38 CFR 4.71a for the same joint once an evaluation is assigned under Diagnostic Codes 5051–5056, unless otherwise directed. Note (2) provides that a revision procedure is evaluated in the same manner as the original only if all the original components are replaced — so a partial revision does not restart the 100 percent clock.
Total Replacement, Resurfacing, and What Falls Outside DC 5055
Resurfacing sits in an unusual position. It earns the same four months at 100 percent as a total replacement, but the note to DC 5055 directs that at the conclusion of the 100 percent evaluation period, resurfacing is evaluated under Diagnostic Codes 5256 through 5262, and there is no minimum evaluation for resurfacing. The OIG reviewed a universe of about 3,200 in-scope convalescence claims for hip or knee replacement or resurfacing received and decided between February 7, 2021, and August 31, 2022. Knowing which of these three categories a surgery falls into is the first thing to verify on any decision.
The Evidence That Sets the Convalescence Clock
The second pain point is timing. Veterans compare the deposit to the surgery date, see a mismatch, and cannot tell whether VA made an error or applied a rule they have never read. The rule is in Note (5): the 100 percent rating for four months following implantation of prosthesis or resurfacing under Diagnostic Codes 5054 and 5055 commences after the initial grant of the one-month total rating assigned under 38 CFR 4.30 following hospital discharge. One month plus four months equals five months of total compensation, and the clock starts at discharge, not at surgery.
For implantations before February 7, 2021, Note (4) still controls: the 100 percent rating for one year following implantation of the prosthesis commences after that same initial month, for thirteen months in total. This is the single most misreported fact about knee replacements; most third-party articles still describe the thirteen-month structure as current.
VA's inspector general found that rating specialists assigned an incorrect number of convalescence months in an estimated 1,062 of about 3,200 claims — roughly 33 percent — with periods too long or too short by one to eight months and an estimated average error of 1.59 months. Errors of that size move real money in both directions.
The Operative Report and Discharge Summary
Two documents decide the timeline. The operative report states whether the procedure was a total replacement, a resurfacing, or something narrower, and names the components implanted. The hospital discharge summary supplies the discharge date that starts the 38 CFR 4.30 month. Obtaining both from the treating facility, not just the surgeon's office notes, leaves no room to guess.
Records That Document Chronic Residuals
The evidence that matters after month five is different. Physical therapy notes with measured degrees of flexion and extension over time, orthopedic notes describing pain and weakness, prescriptions for a cane, crutches, walker, or brace, and a lay statement on VA Form 21-4138 describing a bad day all speak to the residual evaluation.
Choosing the Right Rating Path When the 100 Percent Period Ends
When the 100 percent period ends, the rating drops — and this is where veterans most often accept a number they should question. For a prosthetic replacement of the knee joint, the regulation provides 60 percent “with chronic residuals consisting of severe painful motion or weakness in the affected extremity.” Intermediate degrees of residual weakness, pain, or limitation of motion are rated by analogy to Diagnostic Codes 5256, 5261, or 5262. The floor is explicit: “Minimum evaluation, total replacement only — 30.”
That floor does not apply to resurfacing. The note to DC 5055 sends resurfacing to Diagnostic Codes 5256 through 5262 with no minimum, which means a resurfaced knee with good range of motion can land at a noncompensable evaluation. The OIG reported that its team did not identify any processing errors related to hip and knee resurfacing procedures, so the exposure sits in the replacement path.
The 30 Percent Floor and the 60 Percent Tier
The analogous codes set the range between 30 and 60. Diagnostic Code 5256 rates knee ankylosis from 30 percent for a favorable angle in full extension or slight flexion between 0 and 10 degrees, up to 60 percent for extremely unfavorable ankylosis in flexion at an angle of 45 degrees or more. Diagnostic Code 5261 rates limitation of extension: 0 percent at 5 degrees, 10 at 10 degrees, 20 at 15 degrees, 30 at 20 degrees, 40 at 30 degrees, and 50 at 45 degrees. Diagnostic Code 5262 provides 40 percent for nonunion of the tibia and fibula with loose motion requiring a brace.
Note (1) matters here as well. Because an additional 38 CFR 4.71a rating may not be assigned for the same joint once a DC 5055 evaluation is in place, a separate instability rating under Diagnostic Code 5257 is generally unavailable for a replaced knee. The 60 percent tier, not a stack of codes, is the route to a higher evaluation.
Five Steps to Audit a Knee Replacement Rating Decision
The pain point is that the code sheet speaks in effective dates rather than plain English, so a missing month looks like nothing at all. These five steps turn the decision into a checklist.
- Request the rating decision and the code sheet, and confirm that Diagnostic Code 5055 appears rather than a limitation-of-motion code alone. Note every effective date exactly as written.
- Locate the surgery date and the hospital discharge date, then confirm that a 38 CFR 4.30 month was granted first and that four months at 100 percent follow it — five months in total for surgeries on or after February 7, 2021.
- Check the post-convalescence evaluation. For a total replacement it cannot be below the 30 percent minimum. For a resurfacing, confirm the decision applied Diagnostic Codes 5256 through 5262.
- Confirm that special monthly compensation was addressed, which is assignable during the 100 percent period from the earliest date permanent use of crutches is established.
- File the correct document: VA Form 21-526EZ for an increased evaluation, VA Form 20-0995 for a supplemental claim, or VA Form 20-0996 for a higher-level review — and submit an intent to file first to protect the effective date.
Reading the Effective Dates on the Code Sheet
The code sheet lists a start and an end date for each evaluation stage. A correct knee replacement decision shows three stages: the 38 CFR 4.30 month, the four-month 100 percent period, and the residual evaluation that begins when the 100 percent period closes. If any stage is missing, the arithmetic is wrong even when each percentage looks reasonable.
Choosing the Right Form
The OIG found that in an estimated 1,291 claims — about 40 percent — rating specialists failed to make an entry in the evaluation builder that included the initial one-month convalescence period as required. That omission is exactly the kind of error a higher-level review is built to correct, and naming it in writing, with dates, makes the request concrete.
After Convalescence: Reexamination, SMC, and Appeal Lanes
Veterans often brace for a reexamination that never comes. VBA's training guidance states that, generally, unless required by the diagnostic code, reexamination is not required following a period in which a temporary total rating was assigned under 38 CFR 4.30; the rating activity instead reviews the evidence of record and assigns a post-convalescence evaluation based on the residual disability. An examination is requested before that period ends only when the evidence is inadequate, under 38 CFR 3.327(b).
Special Monthly Compensation During the 100 Percent Period
Note (6) to the prosthetic implants table provides that special monthly compensation is assignable during the 100 percent rating period from the earliest date permanent use of crutches is established. Separately, 38 CFR 3.350(i)(1) provides for special monthly compensation where a veteran has a single service-connected disability rated 100 percent along with additional service-connected disability or disabilities independently ratable at 60 percent or more, separate and distinct and involving different anatomical segments or bodily systems. The inspector general found special monthly compensation was not accurately considered in an estimated 574 claims — 18 percent — with specialists granting it to veterans who did not qualify, missing it, or assigning it for an incorrect period.
Supplemental Claim, Higher-Level Review, or Board
Three lanes follow a decision. A supplemental claim on VA Form 20-0995 requires new and relevant evidence, such as an operative report or discharge summary that was never associated with the file. A higher-level review on VA Form 20-0996 asks a senior reviewer for a difference of opinion on the same record and is the natural lane for a miscounted convalescence period, because that error is legal rather than evidentiary. A Board appeal on VA Form 10182 follows if the first two lanes do not resolve it. Filing within one year of the decision protects the original effective date.
For scale, the 2026 rates effective December 1, 2025 pay a veteran alone $552.47 per month at 30 percent, $1,435.02 at 60 percent, and $3,938.58 at 100 percent, according to VA.gov. Confirm current figures on VA.gov before relying on them.
Take the Free VA Claim Readiness Test
Reading a rating decision is a skill, and most veterans are handed one without ever being shown how the pieces fit together. Before filing anything on a knee replacement, find out where the gaps are. The free VA Claim Readiness Test at avoyvet.com walks through the documents, dates, and evidence a strong claim needs, then points to the specific next step for the situation described. It takes a few minutes, costs nothing, and turns a confusing decision letter into a short list of actions. Visit avoyvet.com to take the test and ask AVOY Veteran Navigator AI a question about any part of this process.
Frequently Asked Questions
Does a partial knee replacement qualify for the 100 percent rating under DC 5055?
No. Note (3) to the prosthetic implants table defines “prosthetic replacement” in Diagnostic Code 5055 as a total replacement of the named joint. A unicompartmental or partial knee replacement does not meet that definition, so it does not trigger the four-month 100 percent period and does not carry the 30 percent minimum that follows a total replacement. A partial replacement may still support a temporary total rating for convalescence under 38 CFR 4.30 based on surgery requiring convalescence, and the residual disability is then evaluated under the knee and leg codes, Diagnostic Codes 5256 through 5263. The operative report establishes which procedure was performed, so obtaining it before filing removes the ambiguity.
My knee replacement was in 2019. Does the four-month rule apply?
No. The four-month rule applies to implantations on or after February 7, 2021. For earlier surgeries, Note (4) controls: the 100 percent rating runs for one year following implantation of the prosthesis and commences after the initial grant of the one-month total rating under 38 CFR 4.30, for thirteen months in total. VBA's training materials state both rules side by side. This is why most online articles on knee replacement ratings are out of date rather than wrong. Existing evaluations assigned under the older criteria may also be subject to the protection provisions in 38 CFR 3.951(a), which VBA expressly directs rating specialists to consider.
Can VA rate knee instability separately after a knee replacement?
Generally no. Note (1) to the prosthetic implants table provides that when an evaluation is assigned for joint resurfacing or prosthetic replacement under Diagnostic Codes 5051 through 5056, an additional rating under 38 CFR 4.71a may not also be assigned for that joint unless otherwise directed. That bars a separate instability evaluation under Diagnostic Code 5257 for the same replaced knee. The route to a higher evaluation is the 60 percent tier within Diagnostic Code 5055 itself, which requires chronic residuals of severe painful motion or weakness, or an intermediate evaluation rated by analogy to Diagnostic Codes 5256, 5261, or 5262. A surgical scar is evaluated separately under the skin codes.
What does “severe painful motion or weakness” mean for the 60 percent tier?
The regulation does not define severe with a numerical threshold, which is why the medical record carries the argument. Evidence that speaks to that tier includes measured range of motion showing marked limitation, orthopedic notes describing giving way or buckling, documented quadriceps weakness, a prescription for a cane, crutches, walker, or brace, and a consistent record of pain that limits standing and walking. An intermediate degree of residual weakness, pain, or limitation of motion is rated by analogy to Diagnostic Codes 5256, 5261, or 5262, producing an evaluation between the 30 percent floor and 60 percent. A treating provider, not a checklist, documents severity.
Will VA schedule a C&P exam before the 100 percent period ends?
Often not. VBA's guidance states that, generally, unless required by the diagnostic code, reexamination is not required following a period in which a temporary total rating was assigned under 38 CFR 4.30. Instead, the rating activity reviews the evidence of record and assigns a new post-convalescence evaluation based on the residual disability. An examination is requested before the end of the total disability period only when the record is inadequate to determine that residual disability, under 38 CFR 3.327(b). The consequence is significant: if the file holds no recent range-of-motion measurements, the evaluation is built from whatever is there, so current treatment notes should go in before the period closes.
What is the minimum rating after a knee resurfacing procedure?
There is none. The note to Diagnostic Code 5055 states that at the conclusion of the 100 percent evaluation period, resurfacing is evaluated under Diagnostic Codes 5256 through 5262, and there is no minimum evaluation for resurfacing. That is the sharpest difference between resurfacing and total replacement, which carries a 30 percent floor. A resurfaced knee with near-normal range of motion and no ankylosis or tibia and fibula impairment can therefore receive a noncompensable evaluation once the four months end. Veterans in that position should document limitation of flexion under Diagnostic Code 5260 or extension under Diagnostic Code 5261 with measured degrees, since those codes drive the outcome.
How is special monthly compensation raised on a knee replacement claim?
In writing, with dates. Note (6) provides that special monthly compensation is assignable during the 100 percent rating period from the earliest date permanent use of crutches is established, so the record needs something showing when crutch use began and that it was permanent rather than brief — a discharge instruction, a durable medical equipment order, or a therapy note. Separately, 38 CFR 3.350(i)(1) addresses a single disability rated 100 percent alongside additional disabilities independently ratable at 60 percent or more. The inspector general found special monthly compensation was not accurately considered in an estimated 18 percent of these claims, so an explicit written request on VA Form 21-4138 is worth making.
Educational information only — not legal, medical, or claim representation, and not affiliated with the U.S. Department of Veterans Affairs. For help filing or appealing, contact a VA-accredited VSO (often free), claims agent, or attorney. For current rates, forms, and deadlines, see VA.gov.
