Internal medicine is the most competitive specialty in Japan. Roughly 64,747 clinics declare internal medicine — 61.7% of all clinics nationwide. Physicians in internal medicine account for 36.2% of clinic-based doctors. As the specialty patients turn to first, it fits the independent practice model naturally, but oversupply and red-ocean competition are structural givens.
In 2026, two regulatory shifts landed on top of that saturated market.
1. Macro environment — two structural shifts
The primary care physician function reporting system (effective April 2025)
All hospitals and clinics — excluding advanced treatment hospitals and dental practices — must report their primary care functions to the prefectural governor each January through March via G-MIS, with the results published to residents. The first round was scheduled for January to March 2026.
Reporting is organized into two categories:
- Category 1: in-clinic disclosure, primary care across at least one of 17 clinical domains, and coverage of 40 designated conditions
- Category 2: after-hours care, admission and discharge support, home medical care, and long-term care coordination
The policy pushes toward community-completed care against a backdrop of an ageing rate of 29.3% (as of 2024). For an internal medicine clinic it is administrative burden — and simultaneously an opportunity to make its strengths visible locally.
The FY2026 fee schedule revision
The revision restructured billing around lifestyle disease management, hitting internal medicine economics directly (see Section 3). Overall, it rewards digital utilization, information sharing, and organizational readiness more heavily. In home care, commentary points to a shift toward an era in which "institutions that are organized and connected get chosen."
In other words, revenue is now determined less by outpatient throughput and more by the quality of chronic disease continuity, multidisciplinary coordination, and digital readiness.
2. Characteristics of newly opened clinics
New internal medicine clinics increasingly open with an explicit differentiation design, taking market saturation as given. Tenant-based openings are estimated at ¥50 million to ¥150 million (design and interior ¥20–50 million, medical equipment ¥10–50 million).
On location, major urban areas are increasingly filled with specialized practices, so a general internal medicine clinic is advised to consider developing suburban areas.
Five success factors are commonly cited:
- A clear concept — deciding what you will and will not do before opening
- Building referral relationships with local institutions
- Introducing home care, which carries high average claim points and fits an ageing society
- Multi-channel marketing including web advertising
- Convenience improvements such as weekend and holiday hours
Recent openings add self-pay menus (medical weight loss and similar) and online consultation from day one, diversifying revenue as insured unit prices are held down. Declaring subspecialties — "internal medicine and gastroenterology," "diabetes medicine" — to stand out among 64,747 facilities has become standard practice.
In short: from an era of opening on a general internal medicine sign, to an era of designing specialization, convenience, self-pay, and digital capability before opening.
3. Revenue areas specific to internal medicine
The restructured lifestyle disease management fee — the core of the FY2026 revision
Lifestyle disease management is the backbone of insured revenue in internal medicine. The FY2026 revision is described as follows:
| Item | Key change |
|---|---|
| Lifestyle disease management fee (I) | Diabetic patients may separately bill self-injection guidance fees for other conditions. Blood testing at least once every six months becomes mandatory |
| Concurrent billing with fee (II) | Expanded from 5 items to over 30 (adding specific drug treatment management, asthma treatment management, dementia specialist diagnosis management, and others) |
| Ophthalmology/dental coordination add-on | Newly created; billable once a year with patient consent |
| Care plan documents | Patient signature eliminated, simplifying operations |
The practical impact concentrates in three places: modifying the billing system and EMR, revising test sets to prevent missed six-month blood tests, and building the ophthalmology/dental coordination workflow.
Eliminating the signature reduces front-line burden, and expanded concurrent billing makes it easier to monetize management of elderly patients with multiple conditions. At the same time, judging eligibility across 30-plus concurrently billable items by hand is no longer realistic.
Primary care functions and chronic disease management
With the reporting system in place, continuous management of diabetes, hypertension, and dyslipidemia, preventive care (health checks and vaccinations), and the hub role of referral, back-referral, and long-term care coordination are now clearly positioned as both the core function and the revenue base of internal medicine. Health checks and vaccinations, combined with municipal and corporate programs, form a stable patient acquisition channel.
Fever clinics and online consultation
Fever clinics have persisted beyond the pandemic as part of internal medicine's patient acquisition and community role.
Online consultation shifted from a temporary measure to a permanent pillar in the April 2022 revision, formalizing online first visits. First-visit online usage is reported to have grown 3.2× from 2022 to 2025. Operating requirements include video plus audio consultation (audio-only first visits are not permitted), filing of facility standards, identity verification (My Number card support recommended), and documenting criteria for switching to in-person care in the treatment plan. Guidelines for completing stable-phase hypertension and diabetes follow-up online, and electronic prescription support during FY2026, are active topics.
Home medical care and visiting care
Home care carries high claim value and fits an ageing society, making it a priority growth area. The FY2026 revision advanced healthcare DX (more sophisticated information sharing), formalized the "D to P with N" model in which a physician consults remotely while a nurse attends on site, and shifted add-on evaluation toward digital utilization, information sharing, and organizational readiness. Operational burden rises, but the structure increasingly favors institutions that have built coordination capability.
4. Self-pay services
As insured unit prices remain constrained, self-pay services have spread as a means of diversifying revenue.
The most visible case is medical weight loss using GLP-1 and GIP/GLP-1 receptor agonists. Internal medicine clinics offering obesity and weight management outpatient services using Wegovy, Zepbound, and Mounjaro have grown rapidly, particularly in urban areas. Diabetes practices frequently enter this space using their pharmacological expertise — an area where specialization and self-pay align well.
One clinic's published menu illustrates typical pricing (as published by that clinic; subject to change):
| Menu | Example price |
|---|---|
| Obesity treatment (Mounjaro 2.5mg / 5mg / 7.5mg) | ¥4,500 / ¥8,000 / ¥12,500 per pen |
| Injection initiation and guidance | ¥2,000 (first time only) / blood draw ¥4,000 |
| AGA (finasteride 1mg, 28–84 tablets) | ¥5,000–¥14,000 |
| AGA (oral minoxidil 5mg, 30–90 tablets) | ¥11,000–¥32,000 |
| ED (generic sildenafil 50mg / tadalafil 10mg) | ¥1,000 / ¥1,300 per tablet |
| Placenta (Melsmon injection) | ¥1,000 per ampoule |
Beyond these, IV drips (garlic injections, high-dose vitamin C, fatigue recovery), self-pay vaccines (shingles, pneumococcal, influenza, travel), and placenta therapy have become standard self-pay menus. They can be delivered between insured appointments, require relatively light equipment investment, and appeal on quality of life, aesthetics, and prevention.
The caveats are equally clear. Off-label and cosmetic use of GLP-1 agents may draw safety advisories from academic societies and regulators; compliance with medical advertising guidelines is mandatory; and the separation from insured care for the same patient on the same day (the prohibition on mixed billing) must be maintained. Positioning self-pay as a complement to insured care — rather than making it the primary patient acquisition engine — is the sounder design.
5. Management implications
As the most-declared specialty, internal medicine is oversupplied, and operating on a general internal medicine sign alone gets harder each year. The FY2026 revision and the primary care reporting system have together moved the basis of both revenue and evaluation from outpatient volume to the quality of chronic disease continuity, multidisciplinary coordination, and digital readiness.
Practical moves fall into three layers.
First, strengthen the insured foundation. Adapt to the lifestyle disease management fee changes — mandatory six-month blood testing, expanded concurrent billing, eliminated signatures, the new coordination add-on — through billing system updates and rigorous prevention of missed tests.
Second, extend functions and channels. Use primary care function reporting to make your strengths visible, and diversify acquisition channels and unit price through home and visiting care (including D to P with N), online consultation, and health checks and vaccinations.
Third, supplement revenue through self-pay. Design GLP-1 medical weight loss, IV drips, self-pay vaccines, AGA, and placenta therapy as complementary revenue while observing advertising regulation and the prohibition on mixed billing.
Differentiation starts with clarity about what you will and will not do. Whether you can design the combination of specialization (diabetes, gastroenterology), convenience (weekend hours, online), and self-pay plus digital capability before and around opening determines survival odds in a saturated market.
6. How an AI EMR addresses these problems — feature by feature
The burden in internal medicine concentrates in two places: physician documentation and information coordination. Results have been reported showing AI voice input cutting charting time by over 80%, and an October 2025 case at the Seiwakai Group reported roughly 2,000 hours of work eliminated in three months. A 2023 proof-of-concept by NTT Communications and Nara Prefecture found clinical staff spend roughly 30% of working hours on chart entry — so the time you can win back is not small. Here is how Pottech's AI Karte addresses each of internal medicine's problems, feature by feature.
Here is Pottech's AI Karte mapped to internal medicine's specific problems.
Feature 1: Charting and orders — patient volume itself becomes the payoff
AI structures consultation audio and records it directly as a SOAP note. Web questionnaires and paper forms captured by camera are digitized automatically, and tests, prescriptions, and procedures can be entered in one click via set orders.
Internal medicine has the highest patient counts and documentation volume of any specialty. Even a few minutes saved per encounter becomes hours per day at 60–100 outpatients. Lifestyle disease management generates care plans and guidance records repeatedly, so templates combined with voice input hit directly — consistent with the simplification that followed elimination of the patient signature on care plans.
Feature 2: Billing and claims — don't judge 30+ concurrent billing items by hand
An automated calculation engine checks bundling conflicts, mutually exclusive items, and frequency limits, and determines add-on eligibility automatically.
The FY2026 revision expanded items concurrently billable with the lifestyle disease management fee (II) from five to over thirty. Verifying eligibility for specific drug treatment management, asthma treatment management, dementia specialist diagnosis management and the rest — per patient, per month, by hand — is impractical. The ability to automate concurrent billing determination is, directly, your ability to absorb the revision. Additionally, the new requirement for blood testing at least once every six months is the kind of rule where a missed test invalidates the billing itself. Detecting omissions from order history protects revenue.
Feature 3: Document generation — lower the cost of running coordination add-ons
AI drafts referral letters and certificates from patient data, output after physician review and correction. Registered clinic templates preserve your own wording and format.
The new ophthalmology/dental coordination add-on rewards connecting diabetic patients to eye and dental care. The more coordination is rewarded, the more the effort of writing a referral letter determines whether coordination actually happens. Lower per-letter time means fewer missed add-ons. The positioning of referral and back-referral at the core of primary care functions points the same way.
Feature 4: Integrations and APIs — prepare for function reporting and electronic prescriptions
An OAuth2 gateway, MCP server, HAPI FHIR, and the LINE Messaging API enable integration with external systems and reception terminals.
The primary care function reporting system requires annual reporting of primary care across 17 clinical domains, coverage of 40 designated conditions, and home care delivery records. All of that information already exists inside daily clinical records. Whether your data is structured determines whether reporting is an aggregation task or an investigation. Electronic prescription support during FY2026 and the advancing information sharing in home care rest on the same foundation.
Feature 5: Patient PHR app integration ("Pote-kun") — support continuity by design
The in-clinic EMR and the patient-facing PHR app run on a shared data foundation, covering appointments and QR patient cards, OCR capture of prescriptions with medication reminders, pre-visit web questionnaires, fee notifications, and LINE login with push notifications.
Chronic disease management only works if patients keep coming back. Treatment discontinuation is the single largest revenue risk for an internal medicine clinic, and medication reminders plus next-appointment push notifications act on it directly. As first-visit online usage grows 3.2×, connecting in-person and online care through the patient's own journey matters increasingly.
Feature 6: Practice analytics — separate insured from self-pay
Visit volume, revenue per patient, monthly trends, and patient attributes are aggregated and visualized automatically.
Once GLP-1 and other self-pay services enter an internal medicine practice, insured and self-pay care share the same appointment slots. Their unit economics and cost structures are completely different, so a blended view hides which one is actually earning. Only when profitability is visible by menu item and time slot can slot allocation and pricing be decided. Separated visibility is also a precondition for running self-pay soundly as a complement rather than a replacement.
An AI EMR is not merely a time-saver; it is the infrastructure supporting the shift toward the "connected institution" that the revision rewards. With high patient counts and documentation volume, internal medicine is where the time you win back is largest.
Primary sources
- Funai Consulting, "How the lifestyle disease management fee (I)(II) changes" https://byoin-clinic-keiei.funaisoken.co.jp/blogs/column/life-0475
- Yuyama, "Complete guide to the primary care physician function reporting system" https://www.yuyama.co.jp/column/clinic/primary-care-physician-function-reporting-system/
- DtoD Concierge, "Internal medicine clinic opening trends" https://www.dtod.ne.jp/open/tips/trend-department/details/naika.php
- L-Ope, "Online consultation regulatory trends 2026" https://l-ope.jp/clinic/column/online-clinic-regulation-trends-2026
- Hinode Clinic, "How home medical care changes under the 2026 revision" https://hinode-clinic.com/blog/188385
- CLIUS Clinic Opening Magazine, "Cutting charting time by 80%" https://clius.jp/mag/2026/03/06/karte-ai-nyuryoku/
- CUC Advisory Partners, "Internal medicine industry trends 2025" https://www.cuc-jpn.com/cucap/24135/