Rogue 11: a MDR story
By Mitch on Friday, 27 June 2025, 13:00 - Regulations - Permalink
MDCG 2019-11 rev.1 was published in June 2025. Almost 6 years after the first version.
Despite the passage of time, and the advent of modern AI, nothing has really changed. The rigorous approach is more than ever present in this guide.
Qualification
Crafting a well-defined and clear intended purpose is paramount for the regulatory compliance and safe use of MDSW says the guidance. This is what lots of software editors strive to do. Not for regulatory compliance, but to keep their software outside the regulatory hassle of MDR/IVDR.
Simple search
Some restrictions about what is considered a simple search were added. On purpose, this is consistent with a rigorous approach to consider that using NLP isn't simple search. Searching for patterns in medical images isn't simple search either.
New examples
Some new examples of MDSW were added. This is useful, if you look for some MDSW similar to your case. E.g.: Some VR applications, or SW module integrated in a EHR platform and outputting diagnosis results are actually MDSW.
As long as the definition of medical device in MDR article 2 is what it is, the content of this guidance won't be alleviated. On the contrary, it will be loaded with new examples of MDSW.
We are in a situation opposite to the FDA's law enforcement discretion policy, for example with CDSS.
Classification: Rogue rule 11
Rule 11 is still there, still harmful and merciless for all medical device manufacturers having MDSW in their products:
- Extensive interpretation of sub-rule 11a) Software intended to provide information which is used to take decisions with diagnostic or therapeutic purposes makes almost any kind of SaMD class IIa,
- No change to table 1 Classification Guidance on Rule 11 either. Bloated by class IIa cells and inconsistent with IMDRF table.
But the definition of medical device in MDR isn't limited to diagnosis and treatment. Other modes of actions are present.
If my software is intended to prevent a disease, in which class is it?
Crossing the MD definition and rule 11
In the MD definition, we find the following modes of action:
- diagnosis, prevention, monitoring, prediction, prognosis, treatment or alleviation of disease,
- diagnosis, monitoring, treatment, alleviation of, or compensation for, an injury or disability,
- investigation, replacement or modification of the anatomy or of a physiological or pathological process or state,
- providing information by means of in vitro examination of specimens derived from the human body, including organ, blood and tissue donations,
- devices for the control or support of conception;
- products specifically intended for the cleaning, disinfection or sterilisation of devices (...).
In rule 11, we find the following modes of action:
- 11a: (3 first paragraphs of Rule 11) intended to provide information which is used to take decisions with diagnostic or therapeutic purposes;
- 11b: (Paragraph 4 of Rule 11) intended to monitor physiological processes or parameters;
- 11c: (Paragraph 5 of Rule 11) all other uses.
Some definitions
The definition of medical device uses, several terms, which require a definition.
The definition of diagnosis can be found in MDCG 2022-5:
- Diagnosis is the process of investigation of the anatomy, morphology, the condition or the functions of the human body irrespective if these are physiological or pathological, and subsequent interpretation of this information with a view to determining possible abnormalities. In this context, investigation can include visualisation, detection or measurement.
There is no definition of therapy, therapeutic or treatment or prognosis in MDR or MDCG or MEDDEV documents. Nothing either in 21 CFR or FDA guidance.
Here are definitions from Merriam-Webster dictionary:
- Prognosis: the prospect of recovery as anticipated from the usual course of disease or peculiarities of the case
- Therapeutic: of or relating to the treatment of disease or disorders by remedial agents or methods
- Treatment: the action or way of treating a patient or a condition medically or surgically : management and care to prevent, cure, ameliorate, or slow progression of a medical condition.
The table below takes each word found in the definition of medical device in MDR article 2, and crosses it with the wording of sub-rule 11a: Software intended to provide information which is used to take decisions with XXX purposes.
This exercise was made to envision a maximum of modes of action of a MDSW.
Interpretation of sub-rules vs definition of medical device
SW Purpose | Software class |
---|---|
MDR article 2 definition: diagnosis, prevention, monitoring, prediction, prognosis, treatment or alleviation of disease | |
Software intended to provide information which is used to take decisions with diagnosis of disease purposes | Easy case with word diagnosis in sub-rule 11.a class IIa, class IIb, class III |
Software intended to provide information which is used to take decisions with prevention of disease purposes | The word prevention isn’t present in rule 11. But: The guide contains this example: A device intended to prevent the risk of illnesses or pathologies by analysing physiological parameters (…) can be considered as a device providing information which is used to take decisions with diagnosis purpose (potential detection of pathologies) and in this case is in class IIa Wow, what an extensive interpretation of sub-rule 11.a! This is consistent with the definition of treatment quoted above. class IIa, class IIb, class III However, if the disease has not yet reached the subject, then we cannot talk about treatment. Lots of prevention and prophylaxis actions are performed on healthy subjects. E.g.: COVID prevention doesn’t mean subjects have COVID. Thus, the example of this guide is somewhat misleading, and software for prevention purposes can definitely be in class I. |
Software intended to provide information which is used to take decisions with monitoring of disease purposes | Easy case with word monitoring in sub-rule 11.b class IIa, class IIb |
Software intended to provide information which is used to take decisions with prediction of disease purposes | Prediction of a disease is a way to provide information which is used to take decisions with diagnosis (prediction of evolution of a disease) or therapeutic purposes (prediction of cure), right? Sub-rule 11.a class IIa, class IIb, class III |
Software intended to provide information which is used to take decisions with prognosis of disease purposes | If we have a prognosis, it means that diagnosis is already done. But prognosis of a disease may be a kind of information for therapeutic purposes, right? Sub-rule 11.a class IIa, class IIb, class III It may be class I, if you craft your intended use on the edge of the precipice. Careful, though; you may end up with an upgrade. |
Software intended to provide information which is used to take decisions with treatment of disease purposes | Easy case with word treatment in sub-rule 11.a class IIa, class IIb, class III |
Software intended to provide information which is used to take decisions with alleviation of disease purposes | If we have alleviation of a disease, it means that diagnosis is already done. But alleviation of a disease may be a kind therapeutic purpose, right? Sub-rule 11.a class IIa, class IIb, class III It may be class I, if you craft your intended use in a way demonstrating that alleviation isn’t a treatment. This sounds like something hardly feasible, if you look at the definition of treatment quoted above. |
MDR article 2 definition: diagnosis, monitoring, treatment, alleviation of, or compensation for, an injury or disability | |
Software intended to provide information which is used to take decisions with diagnosis of an injury or disability purposes | Easy case with word diagnosis in sub-rule 11.a class IIa, class IIb, class III |
Software intended to provide information which is used to take decisions with monitoring of an injury or disability purposes | Easy case with word monitoring in sub-rule 11.b class IIa, class IIb |
Software intended to provide information which is used to take decisions with treatment of an injury or disability purposes | Easy case with word treatment in sub-rule 11.a class IIa, class IIb, class III |
Software intended to provide information which is used to take decisions with alleviation of an injury or disability purposes | If we have alleviation of an injury or a disability, it means that diagnosis is already done. But such alleviation may be a kind therapeutic purpose, right? Sub-rule 11.a class IIa, class IIb, class III It may also be class I, if you craft your intended use in a way demonstrating that alleviation isn’t a treatment. This sounds like something hardly feasible, if you look at the definition of treatment quoted above. |
Software intended to provide information which is used to take decisions with compensation for an injury or disability purposes | If we have compensation of an injury or a disability, it means that diagnosis is already done. Such compensation might be a kind therapeutic purpose, right? Sub-rule 11.a class IIa, class IIb, class III It may also be class I, if you craft your intended use in a way demonstrating that compensation isn’t a treatment. This sounds like something more feasible than the case of alleviation. Compensation doesn't mean cure. |
MDR article 2 definition: investigation, replacement or modification of the anatomy or of a physiological or pathological process or state | |
Software intended to provide information which is used to take decisions with purposes of investigation of the anatomy or of a physiological or pathological process or state | If we have investigation, it means that diagnosis is probably ongoing. See the definition of diagnosis above. Thus, such software is intended to provide information which is used to take decisions with diagnosis (or therapeutic) purposes. Sub-rule 11.a class IIa, class IIb, class III |
Software intended to provide information which is used to take decisions with purposes of replacement of the anatomy or of a physiological or pathological process or state | Replacement sounds like therapeutic purpose. Thus, such software is intended to provide information which is used to take decisions with therapeutic purposes. Sub-rule 11.a class IIa, class IIb, class III It may also be class I, if you craft your intended use in a way demonstrating that replacement isn’t a treatment. This sounds like something hardly feasible, if you look at the definition of treatment quoted above. |
Software intended to provide information which is used to take decisions with purposes of modification of the anatomy or of a physiological or pathological process or state | Modification sounds like therapeutic purpose. Thus, such software is intended to provide information which is used to take decisions with therapeutic purposes. Sub-rule 11.a class IIa, class IIb, class III It may also be class I, if you craft your intended use in a way demonstrating that modification isn’t a treatment. This sounds like something hardly feasible, if you look at the definition of treatment quoted above. |
MDR article 2 definition: providing information by means of in vitro examination of specimens derived from the human body, including organ, blood and tissue donations | |
Software intended to provide information which is used to take decisions with purposes of providing information by means of in vitro examination of specimens derived from the human body, including organ, blood and tissue donations | The information by means of in vitro examination may be for any case listed above: diagnosis, prevention, monitoring, prediction, prognosis, treatment, alleviation, compensation. Depending on the intent of this information, search for the case in the lines above in the table. |
MDR article 2 definition doesn't contain the word screening. Let's add it! | |
Software intended to provide information which is used to take decisions with purposes of screening diseases. | Screening of a disease is a way to provide information which is used to take decisions with diagnosis purposes, right? (Merriam-Webster says: to test or examine for the presence of something, such as a disease). Testing the presence of a disease is actually the first step to diagnosis. Sub-rule 11.a class IIa, class IIb, class III |
MDR article 2 definition: devices for the control or support of conception. | |
Software intended to provide information which is used to take decisions with purposes for the control or support of conception. | Easy case, we have an example in the guide class I |
MDR article 2 definition: products specifically intended for the cleaning, disinfection or sterilisation of devices. | |
Software intended to provide information which is used to take decisions with purposes for cleaning, disinfection or sterilisation of devices. | No doubt that this MDSW will fall in rule 14, either directly or by the use of the implementing rule 3.3 class IIa, class IIb |
Class IIa, class IIb, and class III dominate the results of this table. This is not surprising. As soon as software answers to the definition of medical device (diagnosis, treatment, prognosis and so on), it falls into the case of sub-rule 11a. Sub-rule 11a is so broad that almost any type of software delivers information for diagnosis or therapeutic purposes. In a direct or indirect manner, like a 3-cushion billiard shot.
This is why lots of medical device manufacturers strive to craft an intended use, trying to keep their software in class I.
Unsuccessfully, when you read this guidance and interpret sub-rule 11.a in a rigorous way.
Some people greet the addition of an example in class I. One example. Versus lots of cases in higher classes. Nothing to get excited about.
Wishful thinking solution
As already mentioned in a previous post, a little word could be a game changer.
In the good old times of the MDD, we had the rule 10a for active devices where direct diagnosis was covered. Placing MDSW in class IIa. All other software providing information in an indirect way was in class I by rule 12.
Borrowing the spirit of MDD rule 10a, the word direct would make lots of software in class I:
In sub-rule 11.a, replace:
Software intended to provide information which is used to take decisions with diagnosis or therapeutic purposes
By:
Software intended to provide information which is used to take decisions with direct diagnosis or therapeutic purposes.
This little word would change the world of MDSW! Lots of software are used early in the care pathway. Conversely, medical imaging software would stay in class IIa. Their output is actually used for direct diagnosis.
Modular approach
This MDCG guide also contain a welcomed and interesting update of section 7 on the modular approach.
It will be useful for editors of heath-software with modules qualified as MDSW. Thanks to the provided examples.
It also contains a discussion on the combination of MDSW and non-MDSW. This combination shall remain safe and effective.
Evidence of safety and effectiveness shall be brought by:
- Architectural representation of MDSW and non-MDSW, clearly delineating the MDSW boundaries,
- Risk assessment, taking into account software failures coming from non-MDSW, and consequences on MDSW
- Risk assessment, taking into account usability on non-MDSW displaying MDSW output.
Effective segregation
The guide doesn't mention how effective the architectural segregation should be. The words modules, delineate, clarity are present in the guide. We can rely on common practice and estimate that a module running in a micro-service will be better segregated than a library loaded by an executable.
Talking IEC 62304 langage: the MDSW manufacturer shall identify segregation necessary for risk control.
Usability on non-MDSW
This is a new recommendation. And this is consistent with the need of evidence of safety and effectiveness of MDSW and non-MDSW combination.
A result displayed by non-MDSW may be interpreted in a wrong manner by a user. This may be a hazardous situation leading to an unacceptable risk.
Accessory?
The guide is somewhat nice with health software editors. It doesn't re-qualify the non-MDSW displaying results as an accessory to the MDSW!
We can try to see why:
According to MDR definition of accessory: it specifically enable the medical device(s) to be used in accordance with its/their intended purpose(s). We can say that the non-MDSW, by displaying the MDSW result, enables the MDSW to be used in accordance with its intended purpose.
However, the word specifically is present twice in the definition of accessory.
It saves the health-software editors from seeing their existing non-MDSW re-qualified as accessory to the MDSW. An existing non-MDSW displaying electronic health records won't be qualified as accessory, if it displays health records containing the output of some MDSW.
However, a non-MDSW developed specifically to be used in combination with the MDSW will be qualified as accessory to the MDSW.
FDA multiple function device products
As usual, the FDA dealt with this problem long before the MDCG. The guidance on multiple function device products treats this case in a more thorough manner than the MDCG guide!
If you want to find how to document the safety and effectiveness of MDSW combined with non-MDSW, it's worth reading this FDA guidance! In other words, the content of your 510k can be reused in your CE tech file.
European Health Data Space (EHDS)
There is a long paragraph about EHDS in this MDCG guide. EHDS was published in March 2025. It's applicable to health software having electronic health records (EHR). Thus, applicable to the vast majority of health software, called EHR systems in this regulation. Editors will have to implement interoperability according to some common specifications. These specifications should be published by March 2027. The EHDS regulation will be fully applicable by March 2031 for EHR systems.
Fortunately, EHDS regulation requires "self-certification" only. No need to promise your Notified Body you will be compliant.
This paragraph is here to inform health software editors having EHR systems that this regulation will be applicable to them. Given the application dates, we have some time to implement it. However, it will collide with the dates of application of MDR, AI Act, and Cyber Resilience Act. By order of appearance on stage:
- AI Act: August 2027 for MDSW with high-risk AI system (the majority, in fact, per rule 11a),
- CR Act: December 2027 for the non-MDSW part of the health software,
- MDR: December 2028 or December 2027 (if AIMD or Class III implantable, that's very few MDSW) ,
- EHDS: March 2031 for MDSW with an EHR system,
- And the NIS2 directive? That's set by every national transposition.
Lucky you, health software editors with MD, AI systems and EHR systems. You will have the feeling to be transitioning to some EU regulation forever!
Conclusion
The MDCG 2019-11 rev1 doesn't change anything to the MDSW landscape. In lots of cases, sub-rule 11.a will trap you and your MDSW in the class IIa hell. It won't deliver you until you decommission it.
