Guides Specialty billing

Routine foot care billing: the Q7, Q8 and Q9 modifiers

By Marlow’s billing manager, 20+ years in medical billing, former billing manager at Mount Sinai South Nassau, Oceanside · Updated November 9, 2026 · 8 min read

The short answer

Medicare excludes routine foot care unless the patient has a qualifying systemic condition, and the exam’s class findings, reported as Q7, Q8 or Q9, show the condition is severe enough. In New York, Medicare’s contractor allows covered routine foot care once every 60 days and wants the treating MD or DO’s NPI and last-seen date for some diagnoses.

Medicare does not pay for routine foot care: trimming or debriding nails, paring corns and calluses, and similar hygiene care. The exception is a patient whose systemic condition, such as diabetes or peripheral vascular disease, makes that care hazardous for anyone but a professional. The exam proves it with class findings, and the claim reports them with a Q modifier: Q7 for one Class A finding, Q8 for two Class B, Q9 for one Class B and two Class C.

This guide covers the exclusion and its exceptions, the class findings, the rules Medicare’s New York contractor adds (the 60-day frequency limit, the treating physician’s NPI and last-seen date), and the 2027 change for same-day office visits. Rules are as of November 2026.

The exclusion and its exceptions

The Medicare Benefit Policy Manual, chapter 15, section 290 excludes these services from both Part A and Part B, whoever performs them:

cutting or removing corns and calluses
trimming, cutting, clipping or debriding nails
hygienic and preventive care, such as soaking the feet or applying skin creams, when there is no localized illness, injury or symptom

The same section sets out when the care can be covered:

Exception	What it means
Part of a covered service	Routine-type care done as a necessary part of treating something covered, such as an ulcer, wound or infection
Warts	Covered the same way as warts anywhere else on the body
Systemic condition	Metabolic, neurologic or peripheral vascular disease causing severe circulatory problems or loss of sensation in the legs or feet
Mycotic nails	Fungal nails causing marked limitation of walking, pain or secondary infection (pain or infection for a patient who can’t walk), even without a systemic condition

Most routine foot care claims rest on the systemic condition exception, and that is where the Q modifiers come in.

Systemic conditions that can qualify

Section 290 lists the conditions that most often justify coverage. The list is not complete, and a diagnosis on its own is not enough: the severity has to show in the findings.

diabetes mellitus *
arteriosclerosis obliterans (peripheral arteriosclerosis of the legs)
Buerger’s disease
chronic thrombophlebitis *
peripheral neuropathies involving the feet, including those linked to diabetes *, malnutrition or vitamin deficiency *, cancer *, drugs and toxins *, multiple sclerosis *, chronic kidney disease *, traumatic injury, leprosy or neurosyphilis, and certain hereditary disorders

The asterisk matters. For those conditions, the manual says routine care is covered only if the patient is under the active care of an MD or DO who documents the condition. The contractor can treat that requirement as met when the patient saw an MD or DO for the condition in the 6 months before the foot care.

Class findings and the Q modifiers

Section 290.F lets coverage be presumed when the clinician performing the foot care records findings that show severe peripheral involvement. The findings fall into three classes:

Class	Findings
A	Nontraumatic amputation of the foot or an integral skeletal part of it
B	Absent posterior tibial pulse; absent dorsalis pedis pulse; advanced trophic changes (three of: decreased or absent hair growth, thickened nails, pigment changes, thin shiny skin, redness)
C	Claudication; temperature changes such as cold feet; edema; paresthesias; burning

Three combinations meet the presumption, and each has its modifier:

Modifier	Findings documented
Q7	One Class A finding
Q8	Two Class B findings
Q9	One Class B finding and two Class C findings

Two details catch people out:

Trophic changes count as one Class B finding, and only when at least three of the five signs are present. Thick nails plus redness is not a Class B finding.
One Class B and one Class C does not qualify. The combinations are exact.

Findings that fall short can still describe covered care, but the manual says those claims go to the contractor’s medical staff for review rather than being presumed covered.

The New York rules: Wellpoint Federal (formerly NGS)

Medicare claims in New York are processed by the Jurisdiction K contractor, Wellpoint Federal, formerly National Government Services (NGS). Its local coverage determination L33636 and billing article A57759, Routine Foot Care and Debridement of Nails add specific rules. As of the article version effective April 1, 2026:

Which codes need a Q modifier. One of Q7, Q8 or Q9 must be reported with 11055, 11056, 11057, 11719 and G0127, and with 11720 and 11721 when coverage rests on a systemic condition.

The neuropathy exception. If the patient has neuropathy but no vascular impairment, class findings modifiers are not required. The article’s diagnosis lists set out which codes apply.

Mycotic nails. For nail debridement based on a systemic condition, the class findings and modifier apply. The article also expects definitive antifungal options to have been reviewed and discussed with the patient at the first visit. For mycotic nails without a systemic condition, the primary diagnosis is the nail condition and a secondary diagnosis shows the symptom (pain, limited walking or infection).

Frequency. Covered routine foot care is considered necessary once every 60 days. More frequent services are denied as not reasonable and necessary. Debridement of more than five nails in one day may be reviewed.

Treating physician details. For the asterisked diagnoses, the claim must carry the date the patient was last seen and the NPI of the MD or DO actively managing the systemic condition.

What the note must show. The article asks for precise, specific findings: the location, appearance and symptoms of each nail or lesion, and a procedure note that ties each treatment to the findings (for example, “left great toe” or “right foot, fourth digit”). It also states that a diagnosis code alone doesn’t establish severity.

Who can perform it. Covered foot care must need a professional (MD, DO, DPM, NP, CNS or PA). Since December 1, 2023, a registered nurse with a foot care certification may perform it incident to a supervising practitioner, if state scope of practice allows.

Other contractors publish their own articles with different details, so a practice billing Medicare outside New York should read its own contractor’s version.

Codes at a glance

Paraphrased; see the CPT book and HCPCS file for the official descriptors.

Code	What it covers	Q modifier with a systemic condition
11055	Paring or cutting one benign skin lesion (corn or callus)	Required
11056	Paring or cutting two to four lesions	Required
11057	Paring or cutting five or more lesions	Required
11719	Trimming of non-dystrophic nails, any number	Required
11720	Debridement of one to five nails	Required when coverage rests on a systemic condition
11721	Debridement of six or more nails	Required when coverage rests on a systemic condition
G0127	Trimming of dystrophic nails, any number	Required

Same-day office visits, and the 2027 change

All seven codes above carry a 0-day global period in the Medicare fee schedule relative value file. The Wellpoint Federal article applies global surgery rules to them: an office visit the same day is paid only when it is significant and separately identifiable, billed with modifier 25 and supported by the note.

From January 1, 2027, the CY2027 Physician Fee Schedule final rule adds a payment cut. When an office or outpatient E/M visit is billed on the same day as a 0-day global procedure, by the same practitioner or one of the same specialty in the same group, Medicare pays the higher-valued service in full and the others at 80%. CMS proposed 50% and applying it to all global periods; the final rule settled on 20% and 0-day globals only. For a podiatry practice that bills a visit with nail or callus care, the same-day visit will pay less in 2027. See the global surgery guide for the modifier rules.

When Medicare won’t pay: notices and modifiers

Routine foot care that doesn’t meet an exception is a statutory exclusion, not a medical necessity denial. CMS’s guide to advance written notices defines the modifiers:

GY: the service is statutorily excluded. It goes on routine foot care that doesn’t meet an exception, when that care is billed to Medicare.
GX: a voluntary notice was given for an excluded service. An ABN isn’t required for excluded services, but giving one sets expectations with the patient.
GA: a required ABN is on file for a service that may be denied as not necessary, such as care more often than every 60 days.

Commercial plans, Medicare Advantage and NY Medicaid

Medicare Advantage plans, commercial plans and NY Medicaid publish their own foot care policies, with their own documentation, frequency and modifier rules. Read each plan’s current policy, and note the date of the version you read, before assuming Medicare’s rules carry over.

A checklist before the claim goes out

The systemic condition is documented, and for asterisked conditions the MD or DO’s name, NPI and last-seen date (within 6 months) are on file.
The exam records class findings that meet Q7, Q8 or Q9, and the modifier matches.
Trophic changes count only if three of the five signs are recorded.
The last covered routine foot care was at least 60 days ago.
Each nail or lesion treated is identified by location and tied to a finding.
Any same-day visit is separately documented and carries modifier 25.

Sources

General information, not advice on a specific claim, contract or legal question. Rules and rates change; check the linked sources for the current version. CPT® is a registered trademark of the American Medical Association. Code descriptions here are paraphrased.