M72.2 ICD-10 Code: Plantar Fasciitis and Fibromatosis Billing Guide (2026)

What Is ICD-10 Code M72.2?

M72.2 is the ICD-10-CM diagnosis code for plantar fascial fibromatosis, and it is also the code used to report plantar fasciitis. It is valid for HIPAA-covered transactions in FY2026, running October 1, 2025 through September 30, 2026. The code does not carry a laterality character, so the affected foot is documented in the clinical record and shown on the procedure line with modifier RT, LT, or 50.

Covers two conditions:
M72.2 reports both the common plantar fasciitis and the rarer nodular plantar fibromatosis, also called Ledderhose disease, so the clinical note must specify which presentation the patient has.

No laterality subcode:
There is no right, left, or bilateral version of M72.2. The side is carried by the CPT modifier on the procedure line, not by the diagnosis code itself.

Drives medical necessity:
M72.2 is the diagnosis that justifies the CPT service billed alongside it, such as a plantar fascia injection or manual therapy, so a weak diagnosis link is the most common reason the claim stalls.

Why M72.2 Covers Both Plantar Fasciitis and Fibromatosis

Plantar fasciitis is listed as an inclusion term under M72.2 in the ICD-10-CM Tabular List, which means both conditions share one diagnosis code even though they are clinically distinct. Plantar fasciitis is the degenerative heel-pain condition that clinicians increasingly call plantar fasciopathy, because NIH StatPearls notes the near absence of true inflammatory cells in most presentations. Plantar fascial fibromatosis, or Ledderhose disease, is the rarer disorder in which benign fibrous nodules form along the plantar fascia.

The volume sits overwhelmingly on the fasciitis side. The American Academy of Orthopaedic Surgeons reports that roughly 2 million patients are treated for plantar fasciitis each year in the United States, and lifetime incidence approaches 10 percent, rising in women aged 40 to 60. Whichever presentation the patient has, the note must state it clearly. A reviewer who sees M72.2 without supporting documentation that identifies fasciitis or fibromatosis will flag the record. Per the CDC and NCHS ICD-10-CM update, M72.2 remains a valid, billable code for fiscal year 2026.

One question we hear constantly from practice managers is whether they need a separate code for fibromatosis versus fasciitis. They do not. The ICD-10-CM groups both under M72.2, but the distinction matters in the note because the treatment pathway and the payer’s medical necessity criteria differ. A corticosteroid injection makes clinical sense for acute fasciitis but may be questioned for a stable fibrous nodule, so the diagnosis documented in the record must match the service rendered. If your coders need a broader reference for podiatry-specific ICD-10 and CPT pairings, our podiatry billing and coding cheat sheet covers the most commonly billed codes in one place.

Does M72.2 Need a Laterality Code?

No. M72.2 has no laterality character, so there is no right, left, or bilateral version of the code. The affected foot is documented in the medical record, and the side is shown on the procedure line with modifier RT, LT, or 50 for a bilateral service. The diagnosis stays M72.2 regardless of which foot is involved.

This trips up staff who assume every musculoskeletal code takes a side digit. It does not apply here, and it is a useful contrast with a code family most podiatry billers already know. M79.67 is not billable on its own and must extend to M79.671, M79.672, or M79.673 to identify the correct foot. M72.2 is the opposite: it is complete at four characters with the side carried entirely by the CPT modifier. Another musculoskeletal code that follows a similar pattern in podiatry is ICD-10 code M76.60 for Achilles tendinopathy, where laterality is built into the code itself and the biller must extend to the fifth character. Knowing which codes carry their own laterality and which rely on the modifier is a small detail that prevents a significant share of front-end rejections.

In our experience matching providers with billing partners, laterality errors on M72.2 are among the easiest to prevent and among the most common to see on a denial report. The fix is straightforward: train staff that M72.2 never takes a side digit, and build a check into the scrubbing workflow that confirms RT or LT appears on any one-sided CPT line linked to M72.2.

CPT Codes That Pair With M72.2 in Podiatry

M72.2 is the diagnosis that justifies the service you actually bill. These are the CPT pairings a podiatry practice reports most often, along with the billing point that protects each line.

CPT Code	Service	Billing Note
20550	Injection, single tendon sheath, ligament, or aponeurosis (plantar fascia)	Report M72.2 as the diagnosis and add RT or LT for the treated foot.
28890	High-energy extracorporeal shockwave, plantar fascia	Check the payer LCD first. Many plans still classify shockwave as investigational.
97140	Manual therapy techniques, 15 minutes	Time-based service. Document total minutes and the region treated.
97110	Therapeutic exercise, 15 minutes	Usually part of a documented plan of care alongside the evaluation.
99202 to 99215	Office or outpatient E/M visit	Append modifier 25 when a significant, separate E/M is performed the same day as an injection.

For a deeper look at how CPT 20550 is billed for plantar fascia injections specifically, see our CPT 20550 billing guide. That guide covers the injection coding detail, global period considerations, and the modifier 25 logic that applies when the injection is performed alongside an E/M visit on the same date of service.

Across the billing companies we vet, a recurring pattern separates the practices that collect cleanly on M72.2 from the ones that chase denials: the clean practices document the specific service performed, link it to M72.2 with the correct modifier, and verify payer coverage before the claim goes out. The ones that struggle are billing the diagnosis without confirming the procedure is covered under the patient’s plan, especially for shockwave therapy under CPT 28890.

Related Codes Coders Confuse With M72.2

Two nearby code families cause most of the mix-ups in podiatry billing. Use this table to decide when a code stands in for M72.2 and when it should be added alongside it.

Code	Describes	Relationship to M72.2
M72.2	Plantar fascial fibromatosis, includes plantar fasciitis	The primary diagnosis for heel pain arising from the plantar fascia.
M79.671 / .672 / .673	Pain in right, left, or unspecified foot	A symptom code for foot pain not attributed to the fascia. Not a substitute for M72.2 when fasciitis is documented.
M77.30 / .31 / .32	Calcaneal (heel) spur, unspecified, right, or left foot	Report alongside M72.2 when imaging confirms a spur, not in place of it.

The most common issue we see providers run into is coding only M79.671 or M79.672 when the clinical record clearly supports a plantar fasciitis diagnosis. M79.67x is a symptom code for general foot pain. When the provider has documented fasciitis, reporting only the symptom code weakens medical necessity for the procedure and invites a denial or a documentation request from the payer. If the documentation supports fasciitis, M72.2 is the primary code. M79.67x should only appear alone when no specific diagnosis has been established.

The calcaneal spur codes, M77.30 through M77.32, are the other frequent source of confusion. A heel spur and plantar fasciitis are not the same condition, but they often coexist. When imaging confirms a spur in a patient already diagnosed with fasciitis, report M77.31 or M77.32 alongside M72.2 rather than replacing it. Dropping M72.2 in favor of the spur code alone removes the clinical basis for treatments like injection or manual therapy that target the fascia, not the bone.

Top Reasons M72.2 Claims Get Denied

Most M72.2 denials come from a short list of avoidable errors. Providers often come to us after months of recurring denials on plantar fasciitis claims, and the root cause is almost always one of these six issues. Fix them before submission and the code pays cleanly.

• Billing a laterality subcode that does not exist. Staff try to append a right or left character to M72.2. The code has no laterality extension, and the claim rejects on submission.
• Leaving the side off the procedure line. When the CPT service is one-sided, modifier RT or LT must appear on the procedure line even though the diagnosis code carries no laterality.
• Coding a symptom instead of the diagnosis. Reporting only foot pain such as M79.671 when the clinical record supports fasciitis weakens medical necessity for the procedure performed.
• Omitting a confirmed calcaneal spur. When imaging shows a spur, leaving off M77.30 through M77.32 can trigger a documentation query or reduce the specificity of the claim.
• Pairing M72.2 with a non-covered procedure. Some plans treat extracorporeal shockwave therapy, CPT 28890, as investigational. The diagnosis is valid but the procedure denies, so checking the payer’s LCD before submission prevents the surprise.
• Skipping modifier 25 on a same-day E/M. An office visit billed alongside an injection on the same date of service requires modifier 25. Without it, the visit bundles into the procedure and the E/M payment is lost.

How Does Medicare Handle M72.2 for Custom Orthotics?

Medicare generally does not cover a custom foot orthotic billed under HCPCS code L3000 as a standalone benefit for plantar fasciitis. The orthotic must be attached to a covered leg brace to qualify under the Medicare brace benefit, and a diagnosis of plantar fasciitis alone does not meet that threshold. This means the practice cannot bill Medicare for the orthotic using M72.2 as the sole supporting diagnosis and expect payment.

When Medicare will not pay, the practice must follow the correct ABN (Advance Beneficiary Notice) process before providing the orthotic. The patient signs the ABN acknowledging that Medicare is unlikely to cover the item, and the practice can then bill the patient directly. Skipping the ABN step exposes the practice to a refund obligation if the patient disputes the charge after the fact.

For practices that bill orthotics regularly, this is a revenue area worth getting right. A billing partner familiar with podiatry-specific DMEPOS rules knows when the orthotic qualifies under the brace benefit and when it falls outside coverage, which prevents both the denial and the compliance risk of billing the patient without proper notice.

Frequently Asked Questions

Next Steps

• Need the injection detail? See our CPT 20550 billing guide for plantar fascia injection coding, global period rules, and modifier 25 logic.
• Working with Achilles tendinopathy codes? Our guide on ICD-10 code M76.60 covers the laterality extension that M72.2 does not require, so you can see the contrast side by side.
• Want a quick-reference for podiatry coding? Our podiatry billing and coding cheat sheet maps the CPT codes, ICD-10 pairings, and modifiers podiatry billers use most.
• Ready to hand billing off? Get matched with vetted podiatry billing companies that catch M72.2 denials before they cost you.